All perfect praise be to Allah, the Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad, sallallahu ‘alayhi wa sallam, is His slave and Messenger.
If the situation is as you described, then your husband is negligent in fulfilling your rights and the rights of his son over him. It is his duty to provide for you and for his son and to live with you in kindness. He should balance between his duties towards his family and the requirements of his studies and work.
Salmaan Al-Faarisi said to Abu Ad-Dardaa', may Allah be pleased with both of them, "Your self has a right over you, your Lord has a right over you, your guest has a right over you, and your family has a right over you, so give each their due right." They went to the Prophet, sallallahu ‘alayhi wa sallam, and mentioned this to him, so he said, "Salmaan has spoken the truth." [Al-Bukhaari]
Our advice to you is to be patient with your husband and find excuses for him to the best of your ability, along with reminding him of his duties towards his family, especially his wife's right upon him. Please, refer to fatwa 125242.
Allah knows best.