Hi Roberto. Are you currently taking any medications?
It sounds like you may be clinically depressed. This is a serious condition and can worsen over time if left untreated. Some depression is situational and improves with changing the conditions that promoted it, such as getting a new job, moving to a new location, resolving strife in interpersonal relationships, etc. It often requires an evaluation by a mental health professional, including therapy and counseling. Similarly, some forms of depression are the result of a chemical imbalace in the brain and require medication to correct and improve. A qualified mental health professional can determine if this is the case. I would see your GP as soon as possible and be evaluated for this. He or she can provide you a referral to a psychiatrist or clincial psychologist so you can get this properly diagnosed and treated. There is no reason to go on suffering and risk further worsening of the situation.
It would be better to start with an appointment with GP. There may be an underlying undiagnosed medical condition that is causing your symptoms or making them worse. In the meantime, be sure you are getting 7-8 hours of good sleep every night, are eating a balanced diet, are avoiding alcohol and drugs, and are getting outdoors everyday for at least one hour (e.g. walking, hiking, gardening, visting friends, enjoying outdoor cafe, etc).
The exercise has to be on a regular basis, perhaps starting with 3x per week and then increasing up to a daily routine. This should be for 30-45 minutes at a time, as tolerated. Your exercise tolerance will increase as you exercise more. You may even start to experience a "runner's high" after awhile. A balanced diet includes a mixture of carbs, protein and fat, with fruits and vegetable and nuts daily. Here is link from the NHS in the UK that should help you:
Yes, running and doing exercise, in general, can act like an anti-depressant, stimulating the body to make "feel good hormones" such as endorphins. This, along with eating a balanced diet and working on stress reduction can go a long way to helping improve the symptoms of depression and anxiety.
These supplements should be taken only once per day, unless directed otherwise by your GP. After running, you should hydrate with water. Other than that, you can eat whatever is part of your dietary plan...fruits, vegetables, nuts, etc.
You could try running for 30-40 minutes every morning when it is quiter and the air is fresher. You could take the supplements twice daily. You can take them together, preferably one hour prior to eating.
No. These supplements do not cause cancer. You can take them anytime, though they might be absorbed better if you take them 1 hour before or 2 hours after eating.
Glad to help. Keep the faith.
If you do not improve see if you can get some professional help.