So, so sorry to hear that.
Perhaps he can give you a general letter of recommendation that you can take with you to prospective employers. When my daughter was laid off about 18 months ago (along with a bunch of other staff members) the owner of the practice did that for her, giving her multiple copies to bring with her. I think it made a big difference as she got a good job about 4 weeks later.
Also, don't hesitate to network - contact everyone you know, both through this job as well as any other previous employment. This is another thing my daughter did and sure enough, one of her former co-workers from another job (who had left that company around the same time she did) was working for a company who was in the process of hiring for a new position. She got the interview, got the second interview, and then got the job. She's still there and says it's the best job she's had since she's been out of college.
As someone else stated, when one door closes, another one opens. Keep a positive mental attitude and things will fall into place.
Most importantly, don't let the stress of the situation derail your weight loss efforts. Just keep on truckin'!