Cottage Cheese Discharge, Itchy, Tender Breasts, Abdominal Cramps. Negative Pregnancy Test. Worried

Question : My last period was On XXXXXXX 5. First week of July, i had pre-menstrual symptoms like breast tenderness and cramps and i had light bleeding for 3 days. It's very light that I just noticed it when I wiped with tissue. I didn't have any period on August but I still have my regular pre-menstrual symptoms so I thought it's coming out but i was disappointed. First week of September, i had cottage cheesy like discharge for 3days, it's itchy but no odor and just went away on its own. Today, im having this pre-menstrual symptoms again for 4 days now, my breast is so tender and painful, cramps on my abdomen. I feel flushed and exhausted and sleepy most of the time. Half an hour ago, I stand up out of bed and I felt excruciating pain on my left abdomen. At first, I thought I was pregnant but I took 3 home pregnancy test since July and it all came negative. I spoke to my GP and had my urine test done which is negative & blood test & hormones came out all normal according to him. He booked me for a scan but I have to wait a couple of weeks for that. It makes me more anxious as I really want to know what is happening to me asap. I am 3 months delayed now apparently and I am really worried.