Cancer fears - I have extreme fatigue and have started spotting again

Hello. I am 55 years old. I am postmenopausal and due to previous spotting I had the Mirena coil fitted in May. I have a history of bowel cancer (surgery and mop up chemo 2023-2024) and a colposcopy for precancerous cells in 1996/7.

I have extreme fatigue and started spotting again at the start of this week. I am petrified it might be something sinister. 

Please help.