Thanks for the encouragement Veiled, it means so much.

And thanks for your detailed responses. I can't tell you how grateful I am.
I assumed the vomiting was a symptom. I'm not sure he would take it very well if I suggested that though. He would be like "Oh piss off, stop being stupid. I have gastro! What the hell would you know anyway?" (I admit that is me expecting/being prepared for the worst).
I did suggest dry crackers and lemonade actually. He kind of tried, but that was over 3 weeks ago when he was still at home. Hey, I just realised, it really has been more then 2 weeks that he has been on and off vomiting. I am beginning to really think his GP does not understand PTSD at all. I am disappointed to say the least. I would have hoped he'd have some clue, especially since he is taking a fairly keen interest. I thought he was a Dr who was fairly full bottle on mental illness etc. and therefore would know these things, or at least know the importance of checking specifically how sensitive to be....
No visits, no. I tried once 10 days ago and we argued. I need to get myself under control of my emotions better I think. I would love to make up a care pack and take it to him. I have wanted to do it for 2 weeks in various shapes and forms. For example, I feel a need to take him a clean towel as I am pretty sure he only took 1 and can't imagine he has washed it - ew!! But I fear if I show up at all he will lose it. Especially now after the upsetting message he sent me today after the Dr calling him. Maybe I will leave it for a day or two. Only thing is, he tells me how sick he is, then a day later when I ask how he is feeling he always says better. Then next thing I know he is sick again. So I am scared if I take him a care pack in a day or two he will be better by then (or at least think he is) and tell me to stop smothering him, he is fine! I assume if he actually is still sick it may be well received, but otherwise not. And then he will treat me like I am being so stupid and should just get a life...
I did buy him some probiotic drinks for stomach function yesterday and I messaged to ask if he wanted me to drop them off. He said he was too busy and feeling better, but thanks anyway. He then said he may drop by the house today to get them. Is it possible he genuinely does not want me to do things for him so he doesn't have to feel like he "owes" me anything? He has sheepishly said thank you to the 2 or 4 little things I have taken him.
I fully get how the Dr could have overwhelmed him and how it could have seemed like I was tattling and treating him like a kid, and I am yet to make the call to the Dr, but when I do, if he gives me any reason to, I am going to suggest he do some reading on PTSD before he ever try speaking to my hubby again!! I never expected him to screw things up like this. So angry. Maybe he is an easy target for me right now.
He has been suicidal twice I guess. Once it was when he was having an 8 day downer, mostly sleeping. He was coming out of it, about day 6, and I was trying to encourage him to go outside to cut the dogs toenails as I can't do it without cutting her. I said how happy it woud make her and she would give him big kisses afterwards etc.. He told me he felt like if he just did nothing he couldn't stuff anything up. Then he cried quite a lot and it became howling and hanging onto me while he rocked and said "I don't want to live" over and over. Big problem is I was very messed up at the time too and also crying and I told him neither did I. But I don't think he feels like that now, or has since. I hope not anyway. I sure as hell don't. I really worry about hi getting suicidal now as where he is he is alone, most of the time anyway. At least I HOPE SO!! If you get what I mean.
I will have more questions the more I think about this and about my next moves. I might validate my ideas on here I think. It helps me think things thru in my own mind if nothing else. I find myself rehearsing phone calls to him so I can get only the briefest and most important info across and from him each time. And making sure to keep it to as few points as possible. Always being sure to let him know I care as well and that I am sorry he feels so blue. I figured as much with what you say about him later seeing I am just concerned. I am just swallowing all the offence I take to what he says right now and staying calm. I figure then it won't feed his need to insult me etc. I guess.
Thanks again.