I used to feel the same just like you back in my old days.It's actually nothing serious unless you just stick the whole thing in your mind and tell yourself that ' Oh, I have done this and I am gonna feel like this, ' don't ever do or have this feeling in your mind, just relax and take it as normal.Also I believe that your smoking of weed wasn't regular and there was a possible time gap between each of your sessions as you have said, well that could be a reason the way you feel as you take it, I meant - dry mouth, feel like vomiting etc. I normally take sweets or sweet kinda foods whenever I smoke weed, because that adds and extra bit of feelings and it also doesn't keep your mouth dry so you would feel vomiting.You can try this out and test yourself.The best part would be if you can take a cup of tea with a bit of sugar, then you will surely feel good as you take it.