I had to look it up, having never heard of it before:
Labile hypertension is blood pressure that fluctuates abruptly and repeatedly, often causing symptoms such as headache or ringing in the ears. People with labile hypertension often react to emotional stress with an increase in blood pressure. Frequently, traditional blood-pressure medicines have little effect. Some people with labile hypertension require anti-anxiety medications in order to gain control of their blood pressure.
People who are habitually affected by stress — whether from losing a job, feeling pressure at work or simply getting stuck in traffic — may develop high blood pressure that could inflict some of the same damage as full-time hypertension.
Perhaps a benzo like Xanax would be more helpful than any BP meds.
I've long had primary hypertension (in addition to a high resting pulse around 100). I've found beta blockers to be the most effective for me (since they lower my pulse as well as BP) and they do so without any side effects. I take 10mg of bisoprolol daily. I've used atenolol & metoprolol in the past, and they work just fine too. My elderly mother used atenolol.
I find diuretics totally useless; HCTZ might as well be a sugar pill, while furosemide causes me to pee with insanely annoying frequency.
ACE inhibitors, specifically enalapril, is fully effective in lowering my BP, but doesn't lower pulse so it's not of any use to me.
Diltiazem, a calcium channel blocker, lowers both BP & pulse -- so similar to a beta blocker -- but it causes my ankles to swell a little bit. It also still doesn't lower pulse as effectively as a beta blocker.