I did a search on the Community Tab for a spark team that focused on gaining weight, and I only found one small one. The link is above. You might try reaching out to some of those members and see if anyone is active and can help support you.
I totally agree with the other posters that you need to see a physician and ask for a referral to a registered dietician who can help put you on the type of eating program that would take care of you. I'm 5'11'' and I weight 60 lbs more than you do. I can't imagine weighing that much less and feeling good. You doctor might also consider some type of counseling program or anti-anxiety medication that can help reduce your stress right now.
I read an article today and wished I would have saved the link, but it talked about types of food that you can eat to help reduce stress - spinach, almonds, avocados are some of the ones I remember.
In the end, nothing anyone says here will get you well. That will only come if you make the decision and the commitment to take the steps on a daily basis to get to a place of health. I say that out of concern for you and not in a judgmental way. The same is true for those of us who had 60 pounds to lose instead of gain. We all had to make a decision to get healthy and then do the hard work to get there.
You can do it and I hope you decide to do it. Life is to short to suffer and be miserable either overweight, or underweight. It might give your husband some peace if he knew you were going to be alright.