One thing to note: As a Healer a weapon upgrade is not quite as essential as it would be for Tank/DPS, and your i90 armor will be good enough until Ishgard, at which point you'll be getting upgrades from quests/can buy from the stores. The lvl 53 dungeon drops 130 gear, so if you do have any Poetic gear on and upgraded that will be the last dungeon you'll get thats at level with you.

ALSO, make sure to talk to Urianger in the Walking Sands after completing Praetorium if you haven't already. He has three trials you have to beat in order to move on to Ishgard as well.