i suppose their could be a remote connection but there are hundreds of causes of tinnitus and vertigo/dizziness so it would not be prudent to blame these symptoms solely on the use of a cpap. as a matter of fact it would be wise to see an ear nose and throat specialist to be properly evaluated. more often than never the cause is in the inner ear (or brain) and have nothing to do with the use of a cpap. rarely the cpap can cause middle ear pressure issues (from air going up the eustachian tubes) and that can cause tinnitus or dizziness but i suggest that you search for other causes.
can cpap cause tinnitus and motion sickness?