I have had a similiar problem, and the reason was that I forced myself to go deep without equalizing my sinuses properly. My sinuses were blocked by a flu...so after one day of doing that, I could not dive deeper than 5 m without getting my mask part filled with blod. Now it works fine, and 2 weeks later I dived to 46m in a 4-11C lake with no problems. The lesson for me must be: don't force anything, if it hurts it is wrong. If it bleeds, take a break.
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