I'm very weak in sex n my eraction is also very...

Treatment of weak erection and small penis size:

1. specialized jelqing exercises for 10 minutes daily, 5 times a week
2. healthy diet rich in proteins and vitamins
3. penis enlargement pumps which increase the blood flow to the area and make it more erect
4. special medications prescribed by your doctor to treat any underlying cause if found 
5. creams and gels
6. transdermal patches
7. hormone therapy
8. extender devices
9. penis enlargement surgery
10. penis enlargement pumps which increase the blood flow to the area and make it more erect

 What are the causes of weak erection?

1. stress and anxiety
2. psychological factors
3. spinal cord problems
4. vascular diseases
5. tobacco and alcohol
6. obesity
7. tobacco use
8. diabetes
9. hypertension
10. heart diseases
11. some medications like antidepressants and muscle relaxants
12. congenital problems

What are the possible causes of small penis size?

1. genetic causes
2. thyroid hormone deficiency
3. hypogonadism
4. growth hormone deficiency
5. androgen insensitivity

Important investigations for diagnosis:

1. Thyroid test
2. Urine Analysis
3. Prolactin level
4. Testosterone level
5. Blood test CBC
6. Duplex Ultrasound

Advice:

Lifestyle changes are really helpful like stopping tobacco and alcohol, eating healthy and exercising regularly