[Heaven's Night]

Yes this is quite normal. The tissues will athropy mostly from lack of practice and the blood pressure builds up in a way which could hurt as your body is trying to get the usual amount of blood down there beforeit adapts, the body changes tend to ba faster than what your brain can process, so confusing weird stuff and things not working as before is to be expected. 

Unlikely that it is anything other than athropy pain from HRT.