How do I lie about going for speech therapy?

How do I lie about going for speech therapy? As opposed to pre-school stuttering, I started stuttering when I was 10. I'm 27 now, and still stuttering, although I've learned to mask it better with word replacements and filler words. I've dealt with deep shame all my life over my speech, as my parents and siblings weren't very understanding, neither were my teachers and peers. I grew up in a backwater town, where speech therapy was unheard of, hence I never got the help I needed. Which brings me to present day. I'm married now, and I can finally afford to pay for speech therapy on my own. My local university hospital has great programs for adults. However, I don't think I will ever be able to speak to my husband about disappearing once a week to go for therapy. We've never discussed my stuttering, I think he just assumes that that's how I usually speak (I've learnt to mask it well). Like I've said, I experience crippling shame just thinking about my stuttering, so I'll never be able to discuss this with anyone, not even with my husband. I'm thinking of ways to get around him finding out. Anyone have any ideas, or have experienced the same? Do let me know, thanks ! :)