Taking this on face value, it is quite a situation. I can't say that I've ever heard of anyone - male or female - getting away with publicly groping and humiliating someone like that. I would suggest that you:
1. Do not tolerate being treated like this publicly. It is sexual assault, period. Even if it secretly turns you on, which is something I encourage you to explore some other way. If it continues, consider pressing charges. If doing so blows up the social order of your town, too fucking bad. This behavior must never be tolerated, and doing so gives them license to do it to others in the future.
2. Explore your internal feelings for other women. Like you said at the beginning, don't worry about labels, especially the binary label "straight," which is basically meaningless. The vast majority of people have at least some occasional attraction to the same sex. You probably have the most common sexual orientation there is, the peak of the bell curve: those that Kinsey described as "Predominantly heterosexual, but at least incidentally homosexual" in their attractions. Yes, it's normal.
And let's talk about the meaning of the word "attraction" or "attracted," since you said, "I'm not attracted to them but at the same time I'm interested in sex with them." Yes, you are sexually attracted to them, because that's literally what "interested in sex with" means. You're just not romantically attracted. Those are two different things, although many struggle to even recognize a distinction, finding that their sexual attraction aligns perfectly with their romantic attraction. Until some point in their lives when it doesn't, which is what you are describing. This is normal.
Enjoy the freedom this can give you! Exploring sex with someone who attracts you sexually, but doesn't pose a romantic risk to your marriage, might be exactly what you need.
And speaking of your marriage, given that yours is sexless, it's especially normal to become more interested in the same sex. Your subconscious may be steering you that way, because it feels less like cheating. Again, normal.
3. Explore your submissive side. You may be getting turned on by this because you enjoy having someone else in control or otherwise subjugating you. That's normal too (and particularly common amongst people like yourself who are used to being socially dominant). But it would be a lot safer for you to explore your dom/sub feelings privately than in public like this.
4. Consider actually hooking up with a local woman who turns you on and you think you can trust not to humiliate you publicly. It might not be any of these three, but I think it's likely that other women, seeing what's happened, may come up to you privately and express sympathy. Not only might you find a mutual interest with one of these women, one of them might even be willing to dominate you in private, but in a more respectful way. If you don't find anyone locally, and - as you say - you have plenty of money, it is very easy to find dom women online who will give you want. It may even be that you don't actually want to actually have sex with a woman, you just want one to dominate you. The Internet is crawling with dom women of all strips who will indulge you. In fact, I get the impression there are a few mistresses right here in the Lush membership who get off on that kind of thing, and might do it for free.
5. You might want to examine some deeper questions too. Are you allowing youself to be publicly shamed (and presumably socially shunned as a result) because you hate this town and you're trying to self-sabotage your presence there? There may be a better way out than with your tails between your legs. I use the plural because your husband is also being shamed by extension. Are you on some level allowing this to happen out of resentment towards him?
Best of luck to you.