I Have Been Taking Micardis,40 In Morning And 40 At

I have been taking Micardis,40 in morning and 40 at night...took me off 40 at night as my BP was getting low...this morning took BP at 8am 135/66/76 had breakfast and BP has been falling since..129/66/80 at 11.am..now 1pm it,s 123/63/81...don,t feel well and have ringing in my ears...quite lightheaded..l am 70years old and have type 2 which l control with diet only...don,t go back to my GP till next Thursday. Thank you.