There is this monthly
Who is hiring thread, which shows which companies are hiring with H1B. The last one was here[1]
Angel list also has a pretty great job search tool, with both salaries and equity[2]
Note that H1B workers on the US will only be able to start in October this year, so being willing to work remotely for a while can be necessary. Also, H1B process takes a while, not to mention the interviewing (I know this from my own experience).
If you need cash in the meantine, there is also the freelance version of Who is hiring[3]
I'm sorry to hear about you and your co-founder. Breakups happens to many startups. Elad Gil, who advises/invest in startups, recently disclosed[4]:
One Y Combinator founder I spoke with felt that about ~20% of startups in his batch blew up in the first 9-12 months after entering YC due to founder issues.
Yes, it sucks (also, from my experience). But I hope you will get back on your feet soon.
[1] https://news.ycombinator.com/item?id=5304169
[2] https://angel.co/salaries
[3] https://news.ycombinator.com/item?id=5304173
[4] http://blog.eladgil.com/2013/01/how-to-fire-co-founder.html