Are these symptoms related? Help with fatigue and insomnia!?

So. I've been to my doctor several times over a few problems I've been having. He is relating it to stress, work and school. About a month and a half ago I suddenly became very fatigued. All of the time. I'm always tired, and I get a good amount of sleep at night. Well, around 2 weeks I started having some sort of insomnia. It takes me FOREVER to get to sleep and then I wake up every hour on the hour like clockwork. And now to top it all off I've noticed my muscles are very "crampy" for lack of a better term, they're always tight and feel like they're going to spasm at any moment (maybe you know the sensation I'm referring to), especially in my lower legs more specifically my calves. Does anyone know if any of these conditions are linked? My doctor believes it only to be stress, but I'm rather use to work and school nothing is occuring out of the norm. ANY help would be greatly greatly appreciated!!! Thank you!