You could do implosion therapy this way yourself. If some activity is unpleasant, e.g. studying physics or looking at sexual parts, think about doing the activity increasingly while eating or doing something else enjoyable. We have more potential control over many bodily functions than we realized two decades ago. We can alter our own blood pressure, heart rate, skin temperature, acid secretion in the stomach, muscle tension, brain waves, etc. While equipment is not necessary, biofeedback instruments are the only way of knowing the results with any certainty.
Some clinics specialize in pain, headaches, stress, burnout, etc.
Skills Obviously, learning better skills for handling stressful situations is a good way to cope with many emotions. Being assertive overcomes submissiveness. We can learn to tolerate unpleasant conditions and to accept not getting what we want. We can also correct our irrational ideas and errors in logic. Also see the other references below.