I Have Really Bad Groin Pain Which Has Not Went

I have really bad groin pain which has not went away for months now.The doctor prescribed me naproxen, a two week course, which helped relieve the pain but it always came back.I don't want to take naproxen again as i am trying to conceive and it messed up my cycle causing my period to be 8 days late.I am in pain mostly when lying down,making it difficult to sleep.It interferes with my daily life every day .I would be grateful for any advice as i can't go on with this.Thank-you