As above, you'll have a PPL(H) already. If you have an EASA licence, it should list all three in the top box, ATPL, CPL and PPL.
Don't confuse this with the rating. The licence is valid for life, the rating will have the same revalidation terms regardless of the licence, although if not operating commercially perhaps just the LPC every 12 months rather than OPC every 6.
As for medical, if you're being paid you'll likely still need class 1, which will have the same restrictions you have now. Chat to an AME about what you need and why. They're usually very approachable.