A month ago I saw a pain specialist at a clinic in Harley Street, London. He determined me to be suffering from neuropathic pain as a result of a chronic back condition. He put me on a month's trial of various drugs including Naproxen, Tapentadol and Pregabalin. The Pregabalin dose was to be increased on a weekly basis, starting at 50mg a day to 200mg a day on week four. After a week I was suffering from severe stomach pains believed to be a result of the Naproxen so I stopped taking them and it eased a little. By the end of week two I noticed a very positive improvement in the pain that has been ruining my life for the past 18 months. The improvement was around 30%. No drug thus far had helped. I started to feel positive and my mood lifted as a result, then week three came along and things started to change. As I'd increased my Pregabalin to 150mg a day I started to notice more side effects and nasty ones. Firstly I noticed I started getting stomach pain again, along with severe trapped wind that stabbed me. The stomach pain is low down, around belly button and intestine area, this has been accompanied by diarrhea. I have also felt very faint, dizzy and spaced-out. I stuck with it but as I got into week four and increased to 200mg I have felt awful. I have a scary feeling where I cannot seem to wake my body up in the morning. I am in such a deep sleep that I literally cannot move, it's frightening and takes a while to actually wake up! Also, my stomach pain by now has become sporadic but when it hits it is crippling. Cramps and low intense pain that has me laying down sometimes. I saw my pain specialist again yesterday and mentioned all of the above and he was ready to take me off the tabs and put me on Gabapentin but I told him I'm worried to do so as my neuropathic pain has improved by 40-50%. I am in a quandary and don't know what to do?? He also mentioned that the stomach pain could be a side effect of the tapentadol (opiod) rather than the Pregabalin. So he has given me a prescription for Oxycodone if I want to try that instead. I would really appreciate anyway's advice or feedback on Pregabalin, Tapentadol or any of the side effects I've mentioned above.