Yes!
Definitely. I always tend to start meditating every day and then stop and start again all the time. But I just did some meditation today and it helped me incredibly.

Too much negative thinking can make you anxious as well, so it helps with that.
But mostly, since meditation is basically - shutting up (stopping internal chatter) - you don't think negatively or positively about things, you just experience the world, as close as possible right now to reality. Which tends to make you a bit more positive than usual.