It is quite likely that your heart arrhythmia is temporary and that it can be easily corrected, just maybe not in the next six weeks. You're under a lot of strain, and your heart is becoming cranky for all the cortisol and adrenalin it is being subjected to all day long. Your sleep is crappy, your diet not much better, and you may be generally and chronically dehydrated because you're not calm and able to attend to the usual cues about what to do to take care of yourself more calmly and 'better.' (Is this ringing a bell? If not, please disregard...I'm only guessing by what you describe of your circumstances).

When we being to burn the candle at both ends, usually under unique or unusual circumstances, and usually being reactive to inordinate stressors and having to do a lot of 'fancy footwork' when you're not used to all that pressure and urgency, you can go light on fluids, lose electrolytic balance and levels, spend too much time ramped-up thinking of ways to restore yourself to a normal life and to help those whose need is greatest (often not yours!)

Also, when you're getting beyond yourself, you sleep 'different'. It may even bring on temporary or permanent obstructive or central sleep apnea. Sleep apnea, all by itself, can cause the heart to enter a tachyarrhythmia...happened to me.

You may need the temporary services of a health nurse/coach/outreach program in the local community to help you to self-monitor better and to keep your feet under you so that you can help your loved one(s) more strongly and effectively. Or, recognize that now, for the time being, it has to be about you until YOU get as close to whole as you'll ever be over the next few years.