all of which is beside the point
the issue is whether or not OP’s current marriage is valid, not whether it is sacramental.
that cannot be answered until any previous marriage is examined, to determine its validity, not its sacramentality.
OP will not get an answer in this forum that will be specific to her situation because there is no way all the relevant facts can be explored here. That is why the previous marriage must be investigated and judged by those competent to do so, namely the canon law tribunal of the diocese. OP should speak to her pastor in a confidential interview, with an appointment, and give him all the facts not only about her marriage, but about her baptismal status, current and past religious affiliation and so forth. That way the priest can advise her what steps, in what order, may be taken to facilitate her entry into the Catholic Church.
Welcome home, OP!
no matter how long it takes, the journey is in, with and through Christ and we will be praying for you.
no your husband does not have to convert, but he may very well wish to accompany you to at least some of your conversations with the priest, regarding the marriage situation, and to some of your classes, so he will know somewhat of what you are learning, experiencing, and the commitments you will be making.
please do not accept any advice given here regarding a marriage situation as anything but very general, since each situation is unique. The sooner you speak to your pastor the better.