Hi...it's always me who suggests to nix the ERCP before the other tests are done to diagnose PSC because of the fact that it can trigger the disease if it's in its early stages as well as causing pancreatitis.
Considering how many tests you've already had...I think possibly an ERCP might be in order since the doctor is still guessing.
There are other possible reasons for both the lipase and amylase to be high, but an ERCP might be needed to see what's going on if blood tests don't garner any leads.
Yes, there are possible complications/side effects....definitely do the homework and if possible could you get referred to an endocrinologist? Sometimes readings could mean one thing for the specialists. Especially since yours has increased and then dropped.
This is a good site regarding blood tests, etc. Check out the lipase and amylase and other possiblities that could lead to other blood tests.
http://labtestsonline.org/index.html
I sure hope they find out what's going on..you've been through most of the tests already.
Keep us posted.
quincy