For me, exercising/ getting out is all well and good once you’ve got the energy, or motivation to force yourself outside.
Pre that stage, fluffy blanket(s), herbal tea (easier to drink at any temp if you make it then forget / have a good cry first) and some really rubbishy telly (a bit ashamed to admit this was JK on ITV back in the day!) plus the “permission” to allow yourself to ‘wallow’/grieve so you don’t beat yourself up for not leaving the house / not ‘coping’.
oh! Or cuddle a puppy if you’re lucky enough to know one. Pets can help immensely.
Sending positive vibes to those reading who are suffering. I hope today is a brighter day for you