Teeth sensitivity... why tho?! I hate this!!! I can’t est or drink anything without sensitivity...

Definitely use sensodyne or Colgate's pro enamel or relief I can't remember the name but it's one of the two. When brushing spit but don't rinse the paste away. If it persists try placing some paste directly to the area about 3 times a day, no need to brush it in just apply it like a gel.
Things to be concerned about, brushing too hard especially if it's the front teeth, as the gums really thin there, I recommend altering your technique, medium brush, and holding the brush at a 45 degree angle brushing them the gum up and away the top of the tooth. Your purpose is to remove the plaque, also it may be time to get a clean, a build up of tartar and calculus can lead to sensitivity.

Please try and take these into consideration.

If you don't manually brush and use an electric one make sure it has a small head, pressure indicator, also don't scrub hold the brush on the tooth and gently guide it across, let the brush do the work for you.

Gum won't ever grow back but you can prevent it from receding more by altering your technique...
Best wishes and sorry for my rant.