What Causes Abnormal Periods?

can you help me find at least a couple reason I feel like this I am really confused my last period was really weird it was like the blood was thick and not actually blood and then it stopped after like 3 days I think its too much stress I have been sick for 3 weeks have tooken a lot of pregnancy test been to er I don t see I could anyways be but I had a kidney infection I have been drinking a lot of water just peeing like every 1 or 2 hours my back is in pain also but it comes in gos yesterday my back hurt so bad I had a panic attack now today I have stomach pain I have been eating healthy and I did lose weight real fast because I was on pain killers could this also be from them I mean I have been off them for almost a week I have been have the same symptoms for 3 weeks and been to the er all the time and they told me nothing was wrong I don t understand why I am in so much pain I have had gastritis but I have been eating right and not anything bad for you I just don t know and im sick of going to er and my docter is always busy I just don t know what to do anymore :( also its like I am so picky on food I never have been so picky as I am now I mean everything just dosnt look good and all I want is subway all the time and my sence of smell is like sky high you think it can be from stress or kidney infection again or gastritis I just don t know whats going on nor what I should do it really is painful and I just feel like sleeping but im in too much pain to evan sleep I have I have only got a couple of hours and I just want to be not in pain and feel good it is just the worst pain I have ever experienced and I don t know what it is and I also went into a walk in clinic and they still haven t done anything and they said it was probably from my weight but I lost it and im still in pain nothing helps my nausea and cramping feeling I just want to be calm and be able to have a goodnight sleep does anyone have a clue what I should do oh and it does not hurt to pee it actually makes me feel better it just I have been like this for 3 weeks and still have no idea what to do and why no one will help me oh and also I tried to relive it by tums I have tried ginger water I have ate and it still didn t help I just feel like throwing up all the time and im very very dizzy and week I just do not know what to do anymore actullly its been less then a hour or 2 peeing its like I have go bathroom all the time I do not understand and I want to know what is wrong with my body it is very painful and I have tried relaxing not doing too much and just tried sleeping like ive slept but not actually good sleep I just am in too much pain to sleep