Yes, it is possible for the gas bubble to remain longer than 10 weeks, though unlikely. However, if your doctor has given you the okay then you should have no problems.
There are risks to taking any medications. Talk w/ your doctor about your current experience post steroid use. The tapering may not have been gradual enough or you may be experiencing a resurgence in inflammation. After long term steroid use it takes the body awhile to return to "normal".