Are my tremors from marijuana use or anxiety?

I have smoked marijuana on and off for about a year, not ever more than about once every other week. The last two times I smoked, I experienced uncontrollable tremors in my leg. It wasn't painful like a muscle spasm, but it was uncomfortable and unsettling. Was this merely nervousness (this was the first time I had people "over" at my own suite to smoke and I was a little worried that my roommates would be angry)? Or, could this be a side effect of the drug?


Is there a way to stop being so sensitive to noise?

I have sensitive hearing. This is a major problem when I am trying to go to sleep. I find myself singling out every noise. Currently, I live in an apartment close to a major ventilation system. I can hear a very low frequency sound coming from it. It wouldn't bother me except for the fact that it is a random, consistent noise. Think of a ticking clock that doesn't tick at an exact rate, but ticks once, twice, maybe three times every second.

However, my roommate cannot hear this sound and my girlfriend can only hear it if she really strains to. Myself, I can hear it over music, TV, running water, etc...

I am beginning to envy people with hearing disorders. I am at the point I'd be happy to be deaf.

My question is: Is there a way to decrease my hearing ability at least in the lower frequency range?

Thank you.