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Your questions aren’t stupid but they are specific. I can’t imagine there’s a problem with you doing intermittent fasting but given your situation it would be best if you consulted with a doctor for anything more. We’re just idiots on reddit, there’s a limit to how much you should trust what we think.
Never fails to stun me how people approach Internet randos for medical advice.
Please go see a registered professional doctor. Any advice other than this is absolutely dangerous and provided out of sheer ignorance of your unique physiology and medical situation.