Maybe the fact that you are trying very hard to conceal it from your husband and family and loved ones is making you feel more stressed, thus worsening your symptoms.
I think you should start off by telling someone who's close to you about it. Your husband may be a good start. I say this because, well, if he really loves you and cares about you then he is not going to judge you and throw it back in your face when you confide in him. He might be a bit confused and taken aback and think it's weird, but if he loves you then he'll get over it in time because, ultimately, he'll want you to get the help you need.
Also, I know thousands of people have mentioned the smoking, but it would be a really, really good idea to quit. Among all the other health issues that you're well-aware of, the nicotine may well be contributing to your tics and levels of stress because it increases the sympathetic tone of your nervous system (the system that drives the 'fight or flight' mechanism). I know it's very hard to quit, so it may not something you're looking to do at the moment. But it should definitely be on your list of long-term goals. And if/when you do quit, you'll notice all sorts of benefits and improvements to your fitness and physical well-being that you weren't even aware that you were missing.
Having prior bad experiences with doctors is unfortunate, but that doesn't mean that every doctor you see will cause you yet another negative experience. (Let me supplement this by saying that I am currently studying to be a doctor. xD I'm only at the beginning of my studies, but I already have a fair idea of what is good doctoring and what isn't, and I know that there are many good doctors out there, one of whom I aspire to be!) I think if you're desperate enough, you should see a doctor, and they can refer you on to a psychologist or psychiatrist, based on your symptoms.
I haven't experienced anything like what you're experiencing, but my gut feeling is that those who have experienced it will tell you to seek help from a doctor or other trained professional. I think it'd be the best thing. =)