What Causes Delay In Periods, Dizziness, Cramping And Light Spotting?

my last period on 20th July. Since 15th of august i have been really tired and since then i can't sleep properly at night. I feel nauseous and dizzi .. going very often to loo and i think sometimes feel weird smells.. i think i am a bit moody or at least everyone says i get grumpy easily.....My period is about 3-4 days late. i have vomited already 2 times as one of them Monday morning - 22nd. I get some cramping and a very dull lower abdominal pain. Its rather annoying and dull. 22nd i did a pregnancy test and it showed negative and same day in the evening i start having light brownish/pinkish spotting which by the night turned into light redish bleeding and yesterday for me seemed as period kind of i don't know i am not good at distinguishing. However yesterday was feeling dizzy whole day long. I kinda loose appetite because feel heavy but surprisingly manage to finish quite a lot food. Still feel extremely tired. Yesterday had blood test done so waiting the results. Today i am still bleeding but did HPT and showed negative . I still feel dizzy and nauseous.. so i am very worried and confused if i am pregnant or is something wrong?