Vickypk - yes, I've had one and had it removed. It caused bleeding when I shouldn't have so I was investigated like you. I was offered the myosure procedure for removal which you can have with/without ga. I opted for without. It took about 20/30 mins, very little bleeding after and no problems since. I took pain relief before the procedure and it took a little longer to insert the instrument as I have a tilted uterus.The polyp was sent for biopsy and no problems found.
Please don't worry, it's pretty straightforward, google myosure and if that's available to you, go for that.