Lump in groin area

I had a c cection 2 years ago recently about 5 months ago I found a lump in my groin area. I went for ultrasound scan which was vague they couldnt tell me what it  was for 100% they said it could be a Desmond tumour. so they refured me for a mri scan. I'm still 8 weeks into not knowing what it is  the only time it effects me is when I'm on a period the pain is horrendous which makes me feel drained. I have really heavy periods. I can feel the lump getting bigger. Does anyone else have this? I also will say my hormones are all over the place. My moods are horrendous. I'm 26 and I feel drained most days  I would say the pain only effects me when I'm on a period but also if I over do it i feel a bit of pressure in that area. But nothing major. Can anyone please advise me? I'm sick of looking at google and trying to diagnose my self