I have what might be a foolish question. Is it possible that you have a gallbladder problem? It doesn't have to be stones, just sluggishness. Your symptoms suggest it as a possibility. There are two things you can try. The first is to leave your stomach coated. To achieve that take two tablespoons of heavy cream every couple of hours. (You can mix it with ice cream.) The other is to take a teaspoon of apple cider vinegar immediately before eating a normal meal. You also might try eating lots of very small meals.
I was astounded to find I had gallbladder trouble, especially since a sonogram came back negative (no stones). My symptoms were like yours and I almost gave up eating.
If you're problem is hormone related, ssris don't deal with that problem, but there are supplements that do deal with hormone fluctuations. I would never take something as hard to take and quit as an ssri if my problem were hormones. I'd deal with the hormones. As for your stomach, anti-depressants cause a lot of digestive problems -- very common. Now, I've never heard of anyone having both constipation and loose stools -- either you have one or the other. I'd think if it's this severe and you've stopped taking the med that maybe it's a virus or something, but who knows? These drugs are weird. I suffer from chronic severe anxiety, and I've had anti-depressants that gave me constipation, and some that gave me diarrhea, but not both at once. That's pretty strange. I'd see either a doctor for a good work-up, or a naturopath to work on both the digestion problem and the hormonal induced anxiety, but I wouldn't take an ssri for that particular problem.
Your stomach issues may not even be related to the medication. It is highly likely that your anxiety is causing those symptoms. Anxiety and stress problems seem to go hand in hand and they both cause a lot of health problems. I get those same problems when I have a PTSD relapse. What I found to help me is yoga. It is effective at treating anxiety and stress disorders because you learn how to calm your body and relax your mind. I am not of the New Age ideology, but it truly makes me feel at ease. I did relapse recently, but I know that is to be expected from time to time because conditions like these alter your brain functions. Your body is wired to over respond to anxiety so it takes time of learning to manage and counter those symptoms to restore your mind. The great thing about the brain is it's plasticity. Seeing a therapist may help speed up your road to recovery.
I think it's great that you do not want to use medication. Medication will not solve your anxiety problems. It's only a band aid. It will take a lot of effort on your part, but it is possible to free yourself from your anxiety.