Remeron and falling asleep

I'm on 15mg dose. For the first few nights it knocked me out, then for the next four I woke up an hour after falling asleep and vomited!!
Then I had night sweats for a few nights (although I was also having hot flushes in the day due to chronic stress and anxiety so who knows). Then I seemed to have some insomnia and restless leg syndrome (I think that's what it's called) for about a week. It took a month for the anxiety and depression to decrease, but at this point I did experience a noticable difference which made it all worthwhile. However two months in this seems to be coming back.
For the last two months i've been eating chronically and my digestive system seems somewhat sedated!! Don't know if should increase dose or try something else.

weight gain, very vivid dreams, difficulty falling asleep after being on drug for over one year, tired feeling throughout the day, minimal relief from depression, weight gain is the worst-never had this problem before, no energy to exercise.