What could this be? Ideas please? Really frustrating to walk?

Ok so im 17,M, a very fussy eater could say that i eat mainly junk food, Not intentionally but Psychologically its just there. I have a fairly high metabolism if that counts for anything and I smoke.

Anyway to the question : I have poor blood circulation as my hands but mainly feet are always cool, I have pain on my Coccyx (Tailbone, whatever!:P) and it seems to be there for so many hours then it kind of disappears then it comes back the next day even worse than before, but I have a terrible pain top upper left side of thigh and my leg seems to be feel heavy and it's starting too hurt when I put pressure on it & it seems different to a normal strain as it feels more isolated if you know what i mean?:S , both my legs are slightly different in colour tone recently too and it's not tan as i've been covered up thoroughly. Nothing to worry about in your opinions or?

Thanks in advance. xx