Yes that was definitely rape. It doesn't matter how you felt afterwards. When it started you made clear you didn't want it and he forced himself on you anyway. That's rape.
I would definitely talk to a therapist or at the very least think about it by yourself for a while before talking to your husband about it, if you even want to do that at all.
It's rape no matter if it ended well; you were forced to have sex and that is what rape is.
Best thing to do is see a shrink. I would not let my amateur psychologist husband hear this story until you are clear in your mind how you feel about it -- all of this "you show extreme signs of being a rape victim" stuff sounds very pompous and manipulative of him to say. Keep your own counsel and see a professional.
Sounds as if it started as a rape, which I would think rape since that was the guys intention, and since you did not want to haves sex with him, but state you were over powered., regardless of how it ended, or carried on. I would say, yes.
Does your husband know that you were promiscuous? I didn't get the same feeling that your husband sounded pompous or manipulative saying that you are showing the signs of abuse. I think he may have guessed that you were used when younger for sex, and remember, even if a young girl says yes, it is still rape if she is under a certain age. He may lovingly be concerned that your sexuality was manipulated at a very young age, and might want you to be able to look into it for your sake, and as he's your partner, his. (because your sexuality does affect him, intimately). I do agree that you might want to immediately go and talk to a professional, and in doing so, and in receiving the help, you might be truly appreciative that your loved one picked up cues from your relationship. Whether your husband was trying to harm you, or what his intentions are, you would (hopefully) know better than anyone else, but especially those that don't know your husband. However, the sentiment is the same. This is BIG, and this is PERSONAL, and it might be wise for you to receive the best advice right off the bat about how you could deal with it, personally and in your relationship with your husband, moving forward.
What you have described is pretty much my life story, unfortunately. I was abused physically, mentally, spiritually by my father, an acted out promiscuously in my early adulthood. The damages from that lifestyle.. the regret, the otherwise missed opportunities in my life were great. I pray that this is not the case for you. There was also a "sexual revolution" that moved a huge number of people towards free love, drugs and music that affected many and afterward became something some were not comfortable with. In my case, i am very spiritual, and have experience with contacting the dead, (i have two late husbands). Knowing now that what I thought was private (many sexual escapades) could , to one degree or another, become a source of shame for me, if i do not love myself unconditionally and have a partner that loves me unconditionally (as far as my promiscuous behavior and drug/alcohol abuse/addictions). I've never had conversations with the spirit world, i'm not that savvy to date, however, i know that they are in my life, and watching me now, and putting two and two together, realize that i've in the past put on quite a show lol. Hey, if you want to talk about anything, i'm here for you sister. I pray that you and your husband are a great match and that you, personally and as a couple , can handle any and every thing. I'm glad to hear that your husband is getting into the mental health field. I hope this is because of his love for humanity and his wish to help. I commend him, if his intentions are thus. I assume that he's a good guy?