^ really good advice, and if you experience those symptoms, do-wat-he-says
Not sure a couple of times a month is going to count as a prolonged period of use though - might be wrong, but I'd be surprised if you experience much beyond psychological cravings if you become even less-regular with your use.
As I said above though, I would say you've got your use under control. Quit if you want to, and you
really have to
want to, but don't convince yourself you've got a serious problem when (imo) you haven't.
I go out for an overly-expensive meal I can barely afford about once or twice a month. I'd like to every day because I love fine-dining, and with my level of credit, I could easily do it every day and get into debt (the comedown from such an event is truly the worse of them all!!).
In fact, my looking forward to doing it is what makes me
not do it every day. Doesn't mean I have an eating disorder, nor a spending problem. It's just something that gives me pleasure and is on the boundary of what I can/can't afford, and therefore could give me life problems if I indulge too much.
If I didn't do it one month for whatever reason, then I'd think about my next meal out more and more and may even go a bit mad the next time I go out. It wouldn't make me want to do it more often though.
If you'll excuse my rambling here (I'm slightly high obv

), I'm making the comparison to something considered less 'problematic' than weed to make the point that if you enjoy something, and you're not addicted to/dependant on it physically, then doing it every-so-often is fine (and probably quite healthy).
Hope this is the re-assurance and emotional stuff you said you needed.
Feel free to PM me (after you've got a few more posts, of course). Got a lot of 'emotional' experience!!