Im sorry to hear about your symptoms. from what you are describing its likely that you could be suffering from Proctalgia Fugax which isa fancy way of saying that your rectal or anal muscles must be contracting intermittently to cause you pain. It is defined as a transient rectal muscle spasm. This can be due to several underlying causes such as hemorrhoids, electrolyte imbalance, nerve issues or even irritable bowel syndrome. In most cases this can be treated with simple painkillers, or even specialized painkillers like lyrica in some cases. However botulinium toxin injections and nerve stimulation seem to be the order of the day in some cases. Here is some more information about this condition.
Now apart from this, the abdominal tenderness could indicate other issues such as inflammatory bowel disease which can cause abdominal tenderness as well as rectal pain.
My suggestion would be to have this evaluated by your gastroenterologist.
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