All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
First of all, we ask Allaah, the Most High, to give you a way out of your distress and provide for your husband, set him right and rid him of every harm. The best thing we can advise you to do is to be patient and pray to Allaah, as patience and prayer are the weapons of the believer at times of difficulties.
For benefit on the virtue of patience, please refer to Fatwa 83577, and to Fataawa 88514 and 92363 on the virtues of supplication.
Seeking treatment is permissible and it is a form of utilizing permissible means. Usaamah ibn Shareek narrated that the Bedouins asked (the Prophet ): “O Messenger of Allaah, shall we not seek treatment?” The Prophet replied: "Yes, O slaves of Allaah, seek treatment as Allaah has not sent down a disease except that He has sent down a cure for it except old age.” [Abu Daawood and At-Tirmithi]
If your husband refuses the idea of treatment, then you should try to find out the reasons and try to find a solution for each reason. You should try to convince him yourself, and if he is not convinced, then you should try to convince him through those of his relatives and friends whom he respects and it is expected that he will listen to, in order for them to explain to him the importance of treatment and that it may be a means for his happiness and the happiness of his wife.
May Allaah make this easy by His Grace.
Allaah Knows best.