The tingly feeling could definitely be sciatica...let me know when you can see your GP. Diagnostic tests can definitely set your mind at ease...and knowing that you are seeking medical help can take away the anxiety. Good luck!
I had my ecography scan today of the whole abdomen. Everything is okay. The Doctor who did the scan did say that that cannot see the colon with that type of scan, so I suppose thats the next step. Back to the GP. I wonder if it's grumbling appendix?