I also had an ITLB issue... got a professional fit by John Howard (I'm lucky he's local!) and he did SO much to change my fit I was floored... RAISED my saddle 3/4 inch, changed my cleat position, moved saddle forward, put shims in my cleats cause I was riding like a duck, and told me I had to go to NO FLOAT pedals! I am the exception to the rule, but I need pedals that prevent float or I splay my feet and overpronate badly... I had been off the bike for 2 months with the SAME issues you described... got fit and rode my first century the next month! Fit was in Jan last year, first cent was Tour de Palm Springs... and NO pain!

Good luck and whatever you do, DON'T ignore it and assume it's normal like I did...