Your submission appears put together without any care ("NH", "i", "wont", "cant", "circles", "Bad", "dont", and presumably that hyphen is a minus "-" rather than an en-dash "–" or an em-dash "—" (though it's not that important)).
Unless your achievements are stellar, you are not in a position to neglect these details.
Next, don't bring your grievances with you. Your next employer bears no responsibility for whatever happened to you in the past. Why should they want to deal with someone that is grumpy and entitled?
Focus on your achievements and what you can bring to the job.
Next, continue your search and do find an external offer, then evaluate your options. I would not suggest a confrontational approach with your current employer, threatening to leave. Rather, talk to them and say, sincerely, that you'd like to stay with them, but you cannot afford to forego all of the raise that the other company is offering you. (If you can't say that sincerely, because you do want to leave, then: leave.)
Typically, companies like to retain their talent, as it is expensive and risky to hire and train someone new. That is good for you, but it is always easier to negotiate if you do have an alternative at hand, rather than having to bluff.
