First of all, Tildium ,Losartan and Doxasosin is a fair old "whack " of BP lowering drugs , although you haven't given the doses and that in itself could lower you BP to account for passing out and you trip to A&E.
BP 178/87 and 191/75 is unacceptable to someone who clearly has been on multiple BP lowering drugs and a family history that you have described.
Amlodipine 2.5 is a "p1ssy" little dose, particularly by someone who has been used to significant BP medication.....increase your Amlodipine to 5mgms once a day and monitor your BP at least twice daily initially.
Keep us informed.