That is quite a dilemma indeed groundhog. As HB says only you can decide. Not sure what I'd do if it was me, but feel I'd want tests, scans whatever, but would be looking for another opinion. Is that possible at all? A hysterectomy is a fairly big operation in itself & takes anything from 6 weeks to 3 months generally to recover from. I'm assumimg they would remove your ovaries also, as there is a lump, albeit benign.
I had hysterectomy mid 30s & ovaries were left at that time, only for them to have to remove them 10 years later. One, my left one, was so badly hidden due to adhesions that op took over twice as long. Although I did recover fairly quickly as it was done by keyhole.
Look into all your options before deciding & do let us know how it goes.