abnormal white blood cell counts

Hi there. about 18 months ago i got really bad flu i could bairly move it took me weeks to get over it.
again 6 months ago i got the flu again. i was finding it hard to breath as when i breathed in my back would hurt so much i took tiny lil breaths and i couldnt move as my bones hurt soo much.and everytime i stood up my head felt like it was going to explode and i got dizzy and needed to lay down again.my ex had to look after me and the kids. i went to the doctor she was a bit worried as my oxgen was low and i had fast heart rate she took some bloods and sent me for a cheast xray what was fine. she said i must have a slight cheast infection and gave me some painkillers and antibiotics. the painkillers helped with my breathing and my back and the antbiotics only worked for the week i was on them. when i went back to the doctors i was still full of the cold still (sore all over. she had my blood results she said i have a very low white blood cell count and showing signs of infection and took some more bloods. as i was still ill she put me on stronger antibiotics. again after a few days of taken them i felt slightly better when they finished i was getting really bad headache earache dizzyness feeling very weak. i had a doc appointment my bloods were still showing signs of infection and white blood cells still low.then said im at risk of infection and try to stay away from crowded places. i got sent up to the hosp for another cheast xray what was fine again then got put on more antibiotics and she took bloods again and asked me for a sample of the green spit i was caughing up. antibiotics again only worked for a bit then im ill again.i got a letter thru from the doctor telling me they want repeat blood tests in the next 2 weeks, i missed my appontment for that as i couldnt get a baby sitter as im a single mum of 4 kids. 2 days ago my doctor called me telling my the phlem i was caughing up had a infection and asked me to come in asap as this has been going on for to long so today i went back to the doctors. he asked how i was feeling i told him i still had a sore cheast  and i keep getting dizzy my bones ache my back hurts im geting terrible headache and jawache my fever goes up and down and im soo tired all the time no matter how long i sleep. he said my white blood cell count is now high and he wants more bloods and put me on antibiotics he said if it dosnt work this time. im going to sent you for a C.T scan.  now im geting worried iv had a cheast infection for 6 months i have trouble catching my breath to and still in pain. if i look up my symtoms (symptoms) online it all points to cancer. is this signs of cancer? and what should i do im 25 years old with 4 kids 1 witch is desabled and they need me.:( i just want the pain to go away. please help. nicci