I feel a loss of consciousness when I am off of Paxidep. What should be done?

Hello doctor,

I am a professor and I teach daily for six to seven hours in standing position. Two years ago suddenly I felt a loss of consciousness and restlessness. This increases when I speak on an elevated platform. I have a high fear to get down and there is an appearance of loss of control in the legs but never have I fallen down. When this started, my BP became low and I had severe neck pain and ache. I contacted doctors and some said I had anxiety and some depression, B12 deficiency, and some told that it is due to the standing problem. One neurologist gave me Panazep 25 mg. When I started taking it, the problem disappeared. But after taking it for six months, I decided to stop it. The problem started again and so I started taking Paxidep 12.5 mg. Whenever I stop the medication, the problem recurs. When I do not take Paxidep and take rest, I have no problem. But, when I have to take a class being off of Paxidep, I feel to get the same symptoms again. I feel like falling down and have a loss of control and loss of consciousness. I consulted a neurophysician and he told me it is due to low supply of blood to the brain due to standing. He did an MRI and a carotid doppler of the nerves of the neck and everything was normal. I have also had ANA positive but the antiphospholipid and the related tests were negative. He told me to take Moracetam 800 mg twice daily and Multineuron Forte one daily. He told me to stop the Paxidep, but when I stop it I face the same problem again. I now take one table in a gap of one day. Please tell me what to do? What kind of disease is this? Whom should I contact? A neurologist, a psychiatrist or a rheumatologist?

Thank you doctor,

Is it harmful to take SSRI for a long time? My BP remains normal even while standing. Can you please tell me if a psychiatrist would be able to deal with the anxiety?