I am sorry that you are struggling with this current fear. I know how it is to have the relentless worries of Health Anxiety...miserable. :/
Straining with a bowel movement, and IBS-C (IBS with constipation rather than diarrhea) can both cause hemmorhoids and fissures that can be chronic. They start to heal, only to be
opened again with the next difficult BM.
You are virtually at no risk for what you fear...and besides that, your symptoms do not match (occult blood is black, not fresh/red)
...plus, you have a history with Health Anxiety...all pointing to the same conclusion...
You should focus your energy on getting treatment for the anxiety issue.
Have you talked yet to your doctor about
medication and or therapy? If not, this should be your next step.
Additional steps are to stop Googling symptoms immediately as it will just feed your fears....and instead, have a look at the top of the main forum page here where you will find our Resources. We have great material there to get started on...including links specifically for Heath Anxiety self help.
Keep posting with us as well if you find it helpful. We understand, care and support is key!
"Courage is not the abscence of fear, it is feeling afraid and doing it anyway!"
"Worrying does not empty tomorrow of its troubles...it empties today of its strength."
Corrie Ten Boom
Panic Syndrome recovery due to CBT