Sorry to hear about your problems. Well my sense about this is that perceptions of what is going on inside ourselves, sometimes and maybe usually are how we interpret them, but not always. So the "wriggling" may not be related to any parasitic infection. Can you get any parasitic infection evaluated through blood tests and cultures or stool samples? You may not have parasites, and taking anti-parasitical medication, whether it be by prescription drugs or herbal in origin, can be very damaging to health taken over long term.
I don't see a need to take hydrogen peroxide either. Surely the best thing to do would be to try and pursue a balanced healthy life style and expand your interests so those sensations do not take up so much of your focus. And getting in put from a well qualified and experienced naturopath and GP would help.
It is possible you have scar tissue or adhesions from the surgery. They can produce uncomfortable feelings and cause some problems in some people. But I feel that the most important thing is that you stop taking anything toxic that is meant to kill parasites until you have any evidence that they actually have them, as the very toxins that paralyse the nervous system of the parasites can also in large or persistant doses damage the human nervous sytem.
Well I hope your health improves. I think you need some medical advice from a doctor you trust.
Adelaide