Symptoms and strong line on at home fit test. Im a mess!

First of all I have a very suffer anxiety disorder with massive anxiety over health so this is making it so much harder, I am an absolute mess right now, I have been having symptoms for a while now at first they would only last a day and be gone the next but for the past 5 weeks the symptoms have been constant,I have constant pressure in the rectum ( which while I think about it ive had this for quite a long time), a frequent desperate urge to go to the toilet and either not passing anything or just passing mucus,episodes of mainly left sided stomach pain sometimes going in to my back, passing large amounts of clear mucus without even knowing and when I do go to the toilet its just small lumps but I have a feeling like something larger is pushing out ( if that makes sense). Ive always been constipated due to my medication but now I hardly go to the toilet at all and I have just done a home fit test because I couldnt get the one the doctor gave me back to the surgery and it has come up showing a very very dark line for blood. I am an absolute wreck ive been sick I cant eat and I am just beyond terrified ,I know there is no way ill be sleeping tonight surely it cant be anything else but cancer