Thanks. I ended up being admitted to the hospital for hypokalemia a little bit ago. It's now 11 days since cath and still have pretty severe pain. I've mentioned the pain and nausea to nurse but it's shift change so waiting to see.
It is not uncommon to have some mild tenderness where the insertion of the catheter was located, up to a week or so after the test. However, if you are having extreme pain as you note, then this may be beyond the expected post-procedural pain. Further, lumps in the area may reflect a hematoma (common post-procedure issue of minimal long-term consequence, resolves in 1-2 weeks) but should not be growing in size days after the procedure. Fever as well is concerning that you may have an infection, which is a rare, but possible complication of the procedure.
You should contact your physician's office if you are still having this issue, and if you are not seen in clinic or feel brushed off, you should consider either seeing another cardiologist or a visit (albeit unfortunate) to the ED for evaluation of the groin to rule out concerning complications such as infection, growing hematoma, etc.