You have a diagnosis!
Think of that as a positive thing!

I was ill for 30 years before they diagnosed me, so not knowing what the name is for your pain and what to do about it is frustrating.
Now you have a diagnosis you can research!
This website is full of good information. The library, the internet, medical journals, etc.
Plus, now that you have a diagnosis, you can get the right therapy you need.
You can research that medicine. Ask different pharmacists and look it up on the net. Find out Everything you can learn about it and decide for yourself. And keep your doctor's phone number handy and call if you feel funny.

Don't give up!