@saivi

Sorry to hear your struggles.
The social support issues are tough. It is a lot harder making friends when in the adult world rather than college or earlier.
Adding in the holidays that just passed makes it a tougher time of year for that.
The 'social' family member that I have has joined things like book clubs and hiking clubs to establish a social group in an area after moving.
That may be something you can look into to start trying to find connections.

On the work issue, you really will have to pull whatever energy you can to meet the demands of the job.
It is tough and it sounds like you are dependent on a boss for assignments. That boss will be taking in the needs of the clients and business first when doing assignments.
You will need to focus on rebuilding a reputation with your boss to get more assignments.
Thinking about why you are doing the work you are doing so that you can dive into it with the most effectiveness.
I am guessing you did a bit of training to be able to support clients and you did that with the intention of helping people.
See if you can get yourself during the work part of the day to your best form to be on top of helping people. Also recognize that the job is what helps take care of you and your cat. Try not to beat yourself up about what happened and do your best to repair the damage with your client and boss.

Wishing you the best.