Effexor is one of the harder antidepressants to stop so it's best to slowly reduce the dosage to help avoid withdrawal symptoms.
Seeing as you have now stopped for 10 days I would tuff it out you should start to feel better in the next week or so but if you don't go back and speak with your GP.
It's the norm for things to be unsettled when starting a new medication and it usually take a couple of weeks for things to settle so stick with it.
I try not to worry about the future -- so I take each day just one anxiety attack at a time.
ANXIETY & PANIC FORUM MODERATOR
Diagnosed with:- Asperger's Syndrome, Dyslexia, GAD, Social Anxiety Disorder, Health Anxiety, OCD, Depression and Scheuermann's Disease (Adult)
Medications:- 60mg Prozac, Olanzapine 12.5mg, Dihydrocodeine 180mg per day