Cervical cancer is rare and takes many years to develop from abnormal cells that can be detected from pap smears and biopsies (sometimes necessary after abnormal pap results). There are a number of reasons for spotting and it's usually nothing serious. Keep us posted on what you find out.
The common symptom of bacterial vaginosis which is really REALLY common is smelly discharge. A foul odor that comes or goes but is unmistakable as bad. Then they swab you to determine if you have it. You seem highly stressed and hyper aware and I've been there. You feel every thing at that point. And if you are busy, etc. you probably notice it less. Because you aren't focused on it. I've had a simple cyst which is also quite common with women. It can cause irregular bleeding. It can cause more painful periods. They normally pass on their own. Mine did. I was TTC at the time and was afraid I had a miscarriage but found out I was never pregnant. I also have had BV. The thing with that is that it can come and go. You treat it and think it's gone and then it's back. It's a pain. But antibiotics are fairly good at clearing that up. I also, lucky me, have had hypothyroidism and hormonal imbalances. In my 20's, I had periods every 3 to 4 months due to hypothyroidism and my own natural production of too much estrogen. I had a host of symptoms. Mainly, I got pms right at 3 weeks and then it lasted until I got my period months later (joy). I had dry skin, hair loss, slight weight gain and a slightly depressed mood among other things and I did have occasional spotting. It went on for a year and a half, started out of nowhere and ended without intervention. I was headed to an endocrinologist and waiting for my appointment to take place when the ship just seems to have righted itself. There is some link to low level depression and thyroid issues. so, how's your mood? For BV, take the antibiotics, wear cotton breathable underwear and air out occasionally. If you exercise, change immediately following. It helps. The microbes involved in BV love airless, moist, warm situations. Has anyone ever discussed anxiety with you? It's great that you are on top of your health, for sure. But there is an anxious component to this that makes me wish that this wasn't so. I hope it all gets better soon and you can get to the bottom of why you are feeling this way.
Oh, and PCOS have they done lab work? Blood tests and hormonal levels will help them diagnose that if this is the case. good luck