Hi Techy, definitely request a PSA blood test from your GP, and dependent on the result request a referral to your local urology department.
Your GP may be able to prescribe a drug to help with your waterworks, such as Tamulosin, but you really need to get yourself checked out. The DRE is nothing, and on a scale of one to ten of discomfort - I wouldn’t even describe it as pain - maybe level 2.
Best of luck.
Cheers, John.