Welcome to the boards, glycoman!
It's interesting that your blood pressure soared even more when you started the diclofenac. There are big warning labels regarding diclofenac and other powerful NSAIDS (non-steroidal anti-inflammatory medications), particularly regarding the cardiovascular system. Diclofenac can lead to the onset of new hypertension or increase preexisting hypertension and doctors are supposed to prescribe this drug with caution plus BP should be monitored closely at the beginning of therapy.
DO talk to your doctor about adjusting your Lotrel which is a combo of the calcium channel blocker amlodipine+benazepril (an ACE inhibitor). Don't guess about dosage!
And if metopolol (beta blocker) disagrees with you, definitely tell him/her. It does have many side effects.