Hi and welcome 
I just wanted to suggest two things that you may wish to talk to your doctor about – first, trying an antidepressant, and second, maybe adding a short acting stimulant dose to cover the later part of the day.
The antidepressant may be just what you need to help improve your mood, so that it’s one less thing you have to try so hard at doing. Dealing with any life changing event can cause reactive depression – I see it very frequently in my job as a nurse, and a large number of the patients I deal with are on antidepressants because they are dealing with life changing accidents or illness that have stressed their emotions to breaking point. Don’t make the mistake of believing that ADHD causes low mood – my ADHD son is a very happy person. ADHD actually causes an inability to supress emotions like most people do in public, but doesn’t make the emotions greater or less than normal. If your mood is very low most of the time, then you probably need to consider the possibility of depression (is commonly occurs alongside ADHD, as does anxiety).
Adding a second dose of medication that isn’t as long acting as the Vyvanse might help see you through your day without overdoing the total dose – or maybe you are actually allowed to take a second one (I am not familiar with highest dose allowable for Vyvanse). Some kids are on HUGE doses, and some adults are on small doses – it is not based on bodyweight at all, but rather on response to the drugs (and severity of symptoms to some degree).
Another thought is to find someone (a coach, therapist or similar) who specialises in ADHD to give you and your partner some tips for how to cope with daily life without being bogged down. The CADDAC website has some videos you can watch that might help too (but be warned that some of the videos explaining ADHD can be pretty depressing when you watch them in isolation, but do help lay a foundation for how to deal with ADHD). You are lucky to have a partner who seems like they are in for the long haul. It makes a huge difference to have some support.
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