First, let me answer the second question. What kind of emotional response is generated depends on two factors – our subconscious mental awareness and, through social learning. Our subconscious mental awareness is probably a mental reflex action that comes without learning. For eg, a young child also shows reaction to anger and shouting. This is what is inherent in us. The second thing that affects our emotions is our learning. Through social learning we are taught the meaning of love, joy, hate, anger etc and we are taught to differentiate them.
Technically speaking, our emotions are neuro-hormonal reactions occurring in response to some physical or mental stimulus, which in turn, affect our response to the same stimulus on the physical and mental plane. This may sound like a very unromantic explanation, but it is a fact. Emotions do not come from our heart, they are generated in our brain. All the emotions we feel – love, joy, hate, anger, sorrow etc. are nothing but some primitive algorithms that are processed to generate response on the physical and mental level.

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Now I come back to the first question as to how ‘anger’ is generated. The moment somebody abuses you, your mind perceives it as a threat or offence based on its social learning. To counter this threat, the mind needs to prepare the body and itself for some reaction. Based on the perception of stimulus, some neuro-hormonal reactions are generated which create ’emotions’. What we perceive as ‘anger’ is the after result of that processing. Our mind generate negative thoughts towards the concerned person. The concentration level of mind increases and it is focused on the current situation. Our eyes become prominent. The winking rate decreases, muscles in face and the other parts of the body become tense in anticipation of further action.. In this state we say a person is ‘angry’. But this is the primary response occurring as a reflex phenomenon. There can be a secondary phenomenon like you can also hurl abuses or hit the person, or just walk away. This secondary reaction is based on the intensity of emotions and the integrity of the regulatory mechanisms in our brain.
Sleep and meditation. Try to avoid high intensity exercising like running and weight-lifting. The more your body is working, the more energy you'll lose. Take the time to relax, stretch (keeps your blood circulation to better remove toxins), and use the time to reflect. Ask yourself why you're doing this, and empower your will to finish. Drink lots of water, nap, and go to bed early. Avoid watching TV because it'll disrupt your consciousness and make you hungry (due to all the food commercials).