I think Brunetta has given you "safe" advice. Certainly we all should seek to protect ourselves if we think that something has gone drastically wrong with our health. But we also have to realize that we can worry ourselves to death over our health woes.
You are up in the middle of the night distressed and worried about your health. I realize that you are scared, but you may also be looking at things and seeing differences that have been there all along or are actually quite small. You may well have something going on in your legs, but it won't help you to stress yourself out and stay up all night in worry over the situation.
I think we have to be careful about being overcome by stress and worries about our health. We may think that this attention can keep us healthy and safe, but if we go overboard, we can basically mess up our lives. The whole purpose of staying healthy is to be there to live. To enjoy our lives, to be happy and to have those around us be happy. If we stress over every little health thing, we can not only mess up our happiness, but the stress can actually hurt us.
I'm not saying that you shouldn't get your legs checked out, just that you have to keep your stress and worries balanced and make good choices about care. You can go to the ER, but it may cost a lot. You can go to an urgent care, which will have less expertise right there, but will likely be able to tell you if anything serious is going on. And you can of course call you doctor first thing in the morning.
I think many of us have gone through times of great worry over our health. We have had to look at ourselves and worry that we are just falling apart. I'm not suggesting you are a hypchondriac, just that you are going through the same thing.