A good book on self-growth.
It includes more information than just whether you need a therapist.
It includes a variety of exercises to practise as well as fast practical tricks to aid you on a regular basis.
More points I took from the book:
●It states that emotions are a wave that comes and goes. Learn to ride the wave; don't fear it, don't hide from it; instead acknowledge it, and know that it will pass.
●To manage emotions, focus on physical sensations rather than looping ideas. Observe how your breath quickens, a tiny tingle in your fingertips, a headache building in what section of your head, heat in your cheeks, a tight feeling in your stomach, and so on.
●Try journaling before bed to calm your mind.