Here are some photos of the plant - as you can see, bottom leaves are turning yellow, then eventually brown and dried out. I pull the dry leaves, and there's water in the stems (not the goop that I hear might come out if they're suffering from verticillium rot). Here is what my research has turned up:
For a twice a month arrangement, it's not too bad. Psychologists generally charge by the session. The rates and length of each session are set by the psychologist's professional organization. Where I live, as an example, each session is 50 minutes and the cost is $170 per session.
The Neurologist is a specialist who will probably charge around $100 to $200 for an office visit. Any tests they order like a CAT scan would be extra - a few hundred more. If you live near a medical school or state funded hospital it can be cheaper to go to one of their outpatient clinics.