I Am A 29 Year Old Female Around 19years Ago

I am a 29 year old female around 19years ago I had slipped capital femoral around 6 months ago the same pain started to occur I went for a die injected mri and the results were inconclusive due to the pins interfering with the magnets , the pain has gone away for the most part with a few outbreaks but about two weeks after the injection I found a pea size hard moveable lump in my groin painless unless manipulated a lot . I spoke to my gp about it going on 6 months ago he said keep an eye on it I am scared to go back but the lump has stayed consistent possible enlarged , should I be worried . I have had insomnia and I have narcolepsy so it's very rare for me I am always tired but again have narcolepsy and hypothyroidism .