The issue here isn't the bugs, I think you know already. It's your reaction. You can do all the sprays and inspections and bagging and binning of things that you want, but you really need to get a handle on what sounds like excessive fear. You are right to be concerned that you are over the top here. Any of us would be freaked, angry and upset at bedbugs, which are so hard to get rid of, but the reactions of fearing to sit down anywhere, or holding everything on your lap, etc. -- it's excessive and it's good that you realize it's excessive.
Ask yourself: Have you, in the past, ever found that you tend to over-react to things? I can't help but wonder if this is really the first time you've gotten an answer to a problem ("I've inspected and you're clear at home; it was ONE hitchhiker; go live your life") but haven't been able to accept that answer and have spun out a lot of bad scenarios in your mind. If you tend toward being anxious and running through things over and over and over in your mind when they would be considered finished by others - Well, sit down and really think about whether you've had these kinds of reactions before. If so, or if you're unsure but feel that yes, you tend to be anxious or fixated on things at times -- please get counseling. There's no shame in it.
The fact that you are aware that you're on the verge of "changing your life for the worse" in reaction to this is actually good -- you are still aware of yourself in a fairly objective way. Now you need to let that side of you, the side that sees you're being excessive, do the thinking. A counselor could teach you some coping strategies for keeping on an even keel, if this is not your first time going overboard with your reactions.
If this is the very first time -- ask yourself whether you will feel better if you have another inspection by another company and if you can let this go if you get another clean bill of health at home. If you think that would help, do it, but if you would still be this wound up -- consider help for yourself.
Does your husband realize how upset you are and how much of your mental space this is taking up? If so, does he dismiss it as irrational or does he see that you need his help and support in keeping things in perspective? I hope the latter is the case. If he's dismissive or even teases you about this, you need to talk seriously with him to get him to understand you are concerned for your own mental health here.