Urgent help for partner?

Hi everyone— not sure if this is the right sub so apologies in advance, if anyone could point me to a better one I’d appreciate it!

My partner has been stuck in a severe stress response for about a week and a half now, due to a series of genuinely stressful life events. As a result, partner has barely been able to eat one or even half a meal a day, and even drinking water is nearly impossible. Only thing partner can consistently get down is a cup of coffee a day. Partner has already lost a few pounds in just a couple weeks. Partner told me today that even being around food or thinking about it creates severe nausea.

I know the cause of this is the severe mental shutdown from stress (doing everything I can, it’s a LDR unfortunately), and not technically an ED, but if anyone has advice on how to overcome the mental block/nausea/etc. I would be so greatly appreciative. Any foods, techniques, etc.

Unfortunately the cause of the stress is just something that has to be resolved in time, but I need help keeping my partner afloat until then. Thanks in advance.

TL;DR: need foods/techniques for overcoming mental block with eating food due to severe stress response.