Thank you for writing in to Just Answer.
I'm so sorry to hear about what you are going through. It is clearly a very difficult time for you.
You've mentioned that you've consulted with counselors, tried meditation
, exercise and different doctors but nothing seems to have helped you.
I'm not sure if you have completed a thorough psychiatric evaluation but if not I would recommend that you do that. Apart from the depression that you experience it is possible that there are other psychiatric issues diminishing your quality of life.
Also, the sleep problems you've been experiencing sounds recent - and the nausea and vomiting could be signs of a medical concern (e.g. infection etc.) so I would recommend consulting with a medical doctor to rule out any medical conditions causing the nausea.
Relationship issues, heart breaks can certainly increase depression but therapy should be able to help you process those feelings and effectively cope/deal with it. You could also consider journaling - something that often helps a lot of people. Also, you could consider joining a support group for those who've recently broken up, or suffered heart breaks - as this will help you to feel connected to others in similar situations and you'll know that you're not alone.
What you describe as difficulty in functioning could be a result of underlying anxiety
which often creates a "brain fog" making it hard for us to perform even simple tasks. That is why I would encourage you to complete a full psychiatric assessment so that any psychiatric issues that you're dealing with can be uncovered and identified for appropriate treatment.
I hope this was helpful. Please do let me know if you have questions/thoughts.