Honestly, you should go visit a tax professional. One reason is that they can take care of this in a methodical, unemotional way. They will have the ability to find all forms filed with the IRS over the years, like W-2s, 1099s, etc.
They will also have software that will do all these states and forms - it would be difficult for you for all these forms.
You might look at TurboTax Verified Pros to see if you can find one near you.
Otherwise look for a nearby CPA or Enrolled Agent. Enrolled Agents are admitted to practice before the IRS - that's all they do. Please see Find an Enrolled Agent.
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