Without seeing what you're seeing (we all describe things differently) I'd have to say not to worry if you aren't seeing any open-mouth breathing, or excess salivation &
more bubbles than what you describe so far. That is by no means a guarantee...if that was MY snake, I'd go ahead & feed him: first, to SEE if he's willing to eat, & 2nd,
IF he's sick he may not eat for a while so it's better for him to have more energy to go on right now. I'd do everything I could NOT to stress him, meanwhile...meaning
don't handle him, make sure his cage stats are spot-on & raise the ambient temps by just a couple (2-3) degrees. Feed if he's willing, then let him rest & cross your fingers. Sometimes a mild RI in snakes can be treated conservatively (the BEST way!) by doing this.