I Am Have Been Experiencing Some Weird Symptoms The Last

I am have been experiencing some weird symptoms the last couple of days. I had a rash that covered my torso and shoulders for about two weeks. The rash is much better now although the itching is still there I now am having difficulties to focus in on something or I just lose focus. I feel like I could black out at times but don't. I have experienced some weird breathing issues. Not shortness of breath or not being able to breath but it feels like I need more oxygen then my normal breaths are giving me. These symptons come on for a few minutes then go away then come back again. What should I do?