I can't stop it even with cough candilozenges. I can't stop it even with cough lozenges.

I would say "cough lozenges", but other people might say "cough drops".

I can't stop it even with cough candies. I can't stop it even with cough candies.

I can't stop it, even with cough candies. I can't stop it, even with cough candies.

I will work atfrom home tomorrow. I will work from home tomorrow.

"At" is not wrong, but I think it's more natural sounding to use "from". "Work from home" is a very common phrase.

I will be working at home tomorrow. I will be working at home tomorrow.

Its better to use the future progressive tense here, the action (work) will be ongoing and happening at a specific time in the future. The structure is subject (I) + to be (will be) + verb -ing (working)

So, I will work at home tomorrow. So, I will work at home tomorrow.

What wWould yYou lLike to bBe rResolved? What Would You Like to Be Resolved?

I want to heal my bodrecover my health because I've been infected with corona virus. I want to recover my health because I've been infected with corona virus.

I think it would be more natural to say it this way: "I want to recover from being infected with corona virus/COVID."

I want to heal my bodfix my health because I've been infected with corona virus. I want to fix my health because I've been infected with corona virus.

Sounds more natural this way

I want to heal my body to health because I've been infected with the corona virus. I want my body to heal because I've been infected with the corona virus.

Though my fever has descended these dayssubsided recently, coughing is still very hard for me so far.. (or "I'm still coughing a lot") Though my fever has subsided recently, coughing is still very hard for me. (or "I'm still coughing a lot")

"These days" is usually used for trends or habits. For example, "Every child has their own smart phone these days." I've replaced it with "recently" because I think it sounds more natural, but you could also use "lately" or "over the past few days".

TAlthough my fever has descendedgone down these days, coughing is still very hard for me so far. Although my fever has gone down these days, coughing is still very hard for me.

Descended is more formal, gone down sounds more natural

Though my fever has descended these days, coughing is still very hard for me so far. Though my fever has descended these days, coughing is still very hard for me.