I'm havinge skin allergies. so I stay in bed on my days off.but, even though I'm not sick.

It doeswon't change immediately but where there’s a will, there’s a way.

OPTION A: When I become busy withoverworked, my health falters.¶
OPTION A: When work, I become unwells too busy, my health deteriorates.

注:オリジナルの英文表現は可能です。 ただし、上記の 2 つのオプションの方がスムーズです。

I'mOPTION A: I havinge skin allergies.I and stay in bed on my days off., but I'am not sicknot clinically ill.¶
OPTION B: I have skin rashes and remain in bed on during days off, but am not not formally ill.

提案:英語で書くときに代名詞「I」を少なく使うのは避けましょう。 話すときは、この言葉がよく使われます。 しかし、書くときはあまり使わなくなります。(SUGGESTION: Avoid using the pronoun "I" less when writing in English. When speaking, that word is used a lot. However, when writing it is used less often.)

IALSO POSSIBLE: I have decided to revisew my lifestyle/ habits.

注:「lifestyle habits」という表現はやや冗長です。 「lifestyle」でも「habits」でもどちらでもかまいませんが、両方の単語は必要ありません。

It doesn't changMORE NATURALLY: Perhaps I can't change my lifestyle immediately(,) but where there’s a will, there’s a way.

メモ: 最初のカンマはオプションです。 / NOTE: The 1st comma is optional.

When I becomeget busy with work, I becomestart feeling unwell.

There's nothing wrong with what you had, but I feel this sounds a little more natural.

I'm havinge skin allergies. I stay in bed on my day off., but I'm not sick.

It doesThey won't change immediately but where there’s a will, there’s a way.

I'm having skin allergies. I stay in bed on my day off., but I'm not sick.

I hHave a wWeak bBody.

It's unusual to have periods in titles in English.

When I becomeam busy with work, I becomefeel unwell.

I'm having skin allergies. I stay in bed on my day off., but I'm not don't feel sick.

ItChange doesn't changeoccur immediately, but where there’s a will, there’s a way.

I'm having skin allergies. I stay in bed on my day off.b But I'm not sick.

It doeswon't change immediately but where there’s a will, there’s a way.