How To Withdraw Effexor Safely?

I am on Effexor 150 1 x day for 20 years since my father died. Prescribed by psycharist in Tulsa ok I am 66. No real health issues. Sciatica nerve sometimes. Effexor is not working. My husband lost job 5 years ago and I am terrified of no security. No real savings I am realtor and we both work commission now What do you think about pristiq? How can I get off Effexor safety and least amount of stress Don t want weight gain