Neurological Symptoms

I am here because my DH has been struggling with short-term memory loss for a couple years now. We don't have an official diagnosis yet, but the general consensus seems to be vascular dementia. He asks the same questions over and over again, as if on repeat. We went to his neice's wedding, and then he forgot she got married. He called a friend and left a message, then called again moments later because he forgot he left a message. He asks about old friends who have died in recent years, wanting to know how they are doing. I could go on and on… you all know these symptoms.

For the last few months, DH has been experiencing recurrent, brief episodes of involuntary oral movements that began w/lip smacking, and have shifted to teeth-chomping more recently. They were originally accompanied by a numb sensation in his abdomen, which has now shifted to a numbness in his left thigh. During an episode, he can vaguely describe what he is experiencing, but moments later he forgets it happened altogether.

I'm not sure if it's relevant, but I'll point out that 8 years ago DH's heart stopped briefly, four times during a 24 hour period, and a pacemaker was eventually implanted later that week. His first sign that something was wrong was a numb sensation in his abdomen. It was never determined exactly why his heart stopped that day.

His MRI, CT scan, and EEG are "normal for his age"… whatever that means. I've reached out to the neurologist to ask about these odd neurological sensations DH is experiencing, but have not heard back. I'm not sure what to do.