Hmmm.... never had this problem, but if I did, I think I'd take a raincheck on the diving this weekend. Reason being- I know you mentioned you are on an antibiotic eardrop, but there is sooooo much bacteria and crud in the water that I don't think I would risk worsening the infection. Those little eardrops will be over-run with bacteria. I would weigh the options... dive this weekend, and risk worsening the infection and being out of the water for 2-4 weeks, or don't dive this weekend, get completely healed, and go diving next weekend, and the next, and the next... etc. Just my two cents.... there is always next weekend!