Diuretics :: Atenolol And Bendroflumethiazide Overdosing?

For several years now I have been prescribed both Atenolol and Bendroflumethiazide to control high blood pressure. The medication appears to have been successful, as my b.p. is well within acceptable limits, but lately I have noticed some bouts of giddiness and a kind of 'floating on air' sensation, not unlike mild inebriation. This was unnerving, so I went to my doctor and he checked my b.p. as 110/70, which he said was too substantial a drop to accept, so advised me to discontinue the Bendroflumethiazide and return for a re-check in 3 weeks. Perhaps the two drugs working together are simply more than I need? I am aged 62, non-smoker, light drinker, moderately active (10km charity walk recently) and in good general health. It is possible that, with increasing age, my body has self-adjusted and no longer requires such a level of 'help' to sustain a safe b.p. Time will tell, but for now (and perhaps for good) the Bendroflumethiazide is abandoned, as it was apparently making me feel unsteady and occasionally dizzy. I say 'apparently', because presumably the Atenolol could equally be at fault, but we have to start our experiment somewhere.