The primary object is to determine the feasibility of treating patients diagnosed with either CIC/PBS or rUTI with daily hyperbaric oxygen for a total of 40 treatment sessions during an 8-10 week time period. We wish to better understand the demand and degree of adherence for daily HBOT in these two patient populations to inform future planning and design of randomized, sham controlled and double-blind studies. Given the refractory nature of these two diagnoses, a secondary objective of this study is to determine if there is symptomatic improvement following HBOT compared to pretreatment symptoms using standardized patient symptomology questionnaires` (Global Response Assessment-GRA and Patient's Overall Rating of Improvement in Symptoms-PORIS questionnaires).