Hi flashbambi
The good news is - you don't have to stop taking HRT (unless there is a good medical reason)! Your doctor is quite wrong and completely out of date. Any risks that there are do not even start to count until you reach the average age of natural menopause of 51/52 which you have not yet reached. Most women would be producing oestrogen of their own until this age anyway. Also you were on a very low dose.
Please go back to your GP or better still a different one in the practice, once you have read up about it, and ask to go back on it. Ideally you could have been on a higher dose at your young age because 1 mg oestrogen is not high enough to give the best protection against osteoporosis, and your risks of this are higher if you have a low BMI and small frame.
Look especially at the home page of this website - at the NICE Guidelines, press releases and links (scroll right down untuil you reach them), as well as websites of Women's Health Concern and their fact sheets, and the British Menopause Society - but this one is the best starting point.
Find out who are the menopause specialists at your practice, make an appointment and ask for HRT again! The risks associated with oestrogen only HRT are minimal anyway so there is absolutely no need to suffer. I didn't start it until I was nearly 54 and still on it 10 years later in my 60s - and I have all my womanly apparatus intact!
There are other members like yourself who either went into early menopause naturally or surgically and will also I am sure tell you their experiences.
By all means ask about your pains in case there is something else amiss but if it's gynaecological it could well be due to oestrogen deficiency. Sorry I can't explain the phantom period pains but your muscles generally will start to become lax as collagen decreases so this can affect your whole abdomen as organs start to drop a little....
Read up, ask around and we are here to help - good luck
Hurdity x