If you can hear a clicking i would definately get him checked out straight away as it could be a RI and the sooner you get it sorted the better.

2-3 months is a long time to go unchecked really. Has symptoms got worse or remained the same?

What temps is he at?
Until you get him checked i would bump temps to 94-95 deg to help him out a bit.
My last female i took in with an RI could only be heard clicking when there was no background noise whatso ever.

Im in the uk and My last treatment for RI was £125 including baytril injections , mouth swab and lab sample ect.

Its a small price to pay really for pece of mind and a healthy animal in my eyes