I am in a similar situation with DH having been ill in his care home (Now fully recovered). I tried to remain positive and cheerful during Skype Calls and short shouted conversations with my DDs when they delivered my food shopping, especially as the DGC were often present during these contacts. However, when I phoned DD1 late in the evening to tell her her Dad was ill, I lost it, broke down sobbing, etc. She calmed me down and later explained that she and her Sister had been very worried about me showing no emotion other than cheerful during calls. They had been thinking I had been drinking or popping happy pills!!!
Do talk to your children - they will want to support you during these difficult times.
PS: I wish to state that I have not touched a drop of alcohol since lockdown started, following my DM's advice of never drinking alone. Nor have I taken more than my regular 1 per day antidepressant. However, I do self medicate on Caffeine and Nicotine 