What is the ruling of Islamic law concerning a husband who travels for work but does not send money to his wife, citing financial hardship, while his wife suffers psychologically from this?

A husband must spend on his wife reasonably, and he must not be absent from her for more than six months unless there is an excuse. If the husband becomes unable to provide for maintenance, the wife may refer her case to the court to request separation, or she may endure and remain married to him. Talk to your husband and explain your needs to him. If he does not respond, weigh the harm of divorce against the harm of remaining in this situation, and choose the lesser of the two harms.