What's happening to me?

So lately I've felt really tired and lazy. Also I think I missed my period, by three days. I have been drinking a lot alcohol more so I even thought that could be why. I have bug bites all over my legs, but on my right leg its all black and blue around one bite. But there is a patch of healthy skin around it too. It hurts my whole leg when I touch it and move. I don't know if all of these symptoms are from the same thing or totally different things. Also I have patches of light black and blue on my other thigh, I don't know how I got it. Help!!