Another concrete suggestion, look at recent reviews of albergues. We do not stay at municipal albergues, but do stay at private ones. Most of them we book through booking.com. I read back at least two years to make sure there have been no bedbugsreported. This is, of course, no guarantee that there aren’t any in the place...but at least you know that.
Last year, I did not get bitten, but two pilgrims got bit on a bus I was on!
When I take public transport, I deet before getting on! And Ideet the outside of my bag before we travel on a plane, bus, shuttle or bus, especially at high season!You may want to consult with your physician. I bring an antihistamine which helps with the reaction and use betamethazone on the bites. But again, if you have severe allergies seek medical assistance!