In your first paragraph, the use of "Hi there IT gang," as an introduction is improper unless it is placed in a paragraph on its own. Within the same paragraph it simply becomes a sentence with one too many subjects.
Further, the entire sentence is poorly punctuated and as such has multiple potential subjects. In spoken language it could potentially work as the speaker would insert the punctuation in their speech. In written language, not putting in proper punctuation is just lazy.
"Grammar mistakes"? Say no more.
In the second paragraph, a purist could argue about the use of multiple verb tenses in one sentence. In particular, those used to describe your own action and response: the "went" and "am". Changing the tense so close in one sentence is extremely questionable. It would probably be sent back for retyping.
In the third paragraph, the convention regarding the word "however" is, when it is used as an adverb, to place a comma both prior to and after the word. If you are using it as a conjunction then it is normally written without commas. To have one comma at one end is at best lazy and at worst ambiguous.
But overall I know wot you mean.
(Sorry - my friend is a sub-editor for a local mag and I just couldn't resist. Pathetic of me really but TGIF is my only excuse).