First, rest assured, for anxiety disorders, the data suggests that Clomipramine is among the very best! A very underutilized medication these days.
Second, based on my own success with Clomiprame supplemented with methyl folate, I feel obligated to suggest it to you.
More and more empirical research is coming through that supplementing an antidepressant with Methyl folate (sold as the medical "food" Deplin) greatly increases their efficacy in people with the MTHFR mutation. The methylation cycle is necessary for the production of neurotransmitters. With all sorts of down regulation and that business that no one really understands, correcting the issue is at best a guess. The data is shaky at best on how many folks have this mutation, but I am among the low percentage who is homozygous, meaning I can't process folic acid into it's methylated form, nearly at all. My gut tells me a decent portion of us who don't have an amazing response to antidepressants may have a methylation issue. I went through 7 antidepressants before I landed on Clomipramine. I was on it for about 1 month at minimum therapeutic dosage before adding in methylfolate, 7.5mg a day. Within a week of adding it in it was like night and day. By itself, Clomipramine worked ok, just like the other antidepressants I tried. I definitely could not have a panic attack, but it didn't touch my generalized inner tension.
Methyl folate is not an additional medication, its a B vitamin, and has no side effects to speak of. I would strongly suggest asking your Pdoc about it. You can buy it online as 5-mthf, probably branded as metafolin. It costs me about $1 a day U.S. to supplement my antidepressant with it. Also, I'm not a hippie who believes in the power of dandelion root or healing crystals, so I recommend 5-mthf based on personal experience, peer reviewed studies, and other empirical responses I've encountered.