When did I become so easily stressed? This isn't me!

Recently I've realized how easy it has become for me to feel overwhelmed and stressed out. I didn't used to be this way, what happened?! It seems I am on the verge of a meltdown at least twice a week these days. I don't know what has gotten in to me, but I definitely need to relax. I've also come to realize that when I'm leading into one of these panic-like attacks, I tense up in my shoulders without noticing it. I swear I have a knot the size of a softball between my shoulder blades! I've decided to make it my goal for this weekend to find myself some sort of stress relief that works for me personally. I'm even toying with the idea of yoga. I think it might help with the physical tension I'm feeling. I'll try almost anything to try to make myself feel better. I'm open to anyone's suggestions!!