Good “starting” med for High Blood Pressure?

I’m seeing my GP on Monday. My BP fluctuates but is always high later in the day. My systolic ranges from 120-145 or so and my diastolic is from 90-105 (usually around mid 90′s). My cardio doesn’t think I need any meds but I disagree. I will ask my GP and see if very reasonable about meds. However, I would like to know what the easiest tolerated and best ones are to start with. My cardio’s partner (whom I spoke to tonight) said a diuretic.

Tonight my BP spiked at 158/113 so I definitely want to start on something but don’t want all sorts of side effects. I also have multiple sclerosis so anything that would make me more fatigued would be an issue.

I’d appreciate any feedback so I can have some information when I go to my doctor.

Thank you