a) You won't need kaniamea's suggestions when you correct the general problem.
b) Never copypaste from other sources into the Visual editor (not even by using the PFW option). When you need to paste, paste into the Text editor, so that only the text and no wrong code will be added, then switch to Visual if and when necessary.
c) One way to correct your post is switch the editor to Text, remove all of these:
then enter paragraph breaks where appropriate and click Update.
Perhaps you can do this faster if you select all in the Text editor, copy, paste into a simple text file, use the find-and-replace option to delete all the above, then select all and copy, go back to the Text editor, select all and paste, update.
Alternative way to get rid of the wrong code: select all in the Visual editor, copy, switch to Text, select all, paste, then switch back to Visual to add the formatting for h2 headings and re-insert the images.