Little catch up on dizziness

Well I've had 3 episodes of the dizziness/nausea and last night was pretty bad. My HR dropped to 52 which is pretty low for me and I was quite miserable and just went to bed. Went to the Dr today and he thinks I've got 2 different things going on. I've got a lot of fluid behind the ear causing the dizzy/nausea. I've fought an ear ache for 2 years now so he wants a CT scan to find out why it's not draining. He did EKG and there are some mild abnormalities, but he thinks it's a false alarm caused being in good shape and having lower HR. The abnormal blips could be caused by low potassium, too. However, since I've got a Half next month and full in Aug he wants me to do a stress to make sure all is well. I've been put on easy workouts until we get the test results. Got a B12 shot and meds to try to dry the fluid up behind my ear.