I had what seem to be a normal period for 3 days now and it was gone but have been very tired all the time, have a lot of gas. Go to the washroom every hour sometimes more. Eatting a lot having headaches and back pain and this morning and tonight feel sick like I am going to throw up could I be preganat? I have took test before and they came back negative

No, you not pregnant. I think.

You've had a period which is a good indicator for no. The rest sort of sounds like a UTI. Have you gone to your doctor recently?