Low blood pressure

Since my last stroke 2 years ago I was put on bisprolol losartan and a GTM match to keep my blood pressure low. Now it is low and I am light headed and dizzy clammy but not passing out this feeling lasts for 20 to 25 minutes. Went to the doctor and she reduced my bisoprolol bit made no difference then took me off the losartan and still no difference. Has anyone been like this or just my weird body