Effects of financial burden on PhD research
I had an almost identical situation. Due to financial commitments and the lack of grant, scholarship etc availability - I had to do close to fulltime work while completing my PhD (experimental physics).

I can assure you that I got through it, it was exhausting but very much worth it.

What I did:


As you are doing, keeping the advisor in the loop, informing them of what is required for work (time, energy etc), but at the same time, discussing and setting short and medium term goals.
Set yourself weekly goals, make these achievable and unambiguous.
Give yourself some evenings off to rest, and occasionally a weekend (I did this every 5 weeks).
Keep the sleeping, meal and exercise patterns - can not emphasise how important this is.


and possibly a weird one (but it worked):


keep a notepad or a small printed copy of a task in your pocket.


But, still seek the possibilities for grants, related jobs or scholarships.