9th year of solo parenting?

My husband often goes on overseas business trips, so since our second child was born, I have been struggling with solo parenting. We had our second child later, and since both sets of grandparents are quite elderly, I really cried a lot trying to raise my son alone. Thinking back on those times, I even feel scared about how I managed to get through it. Over half of the year was spent on overseas trips, and when the baby was very young, I would be away on business trips for almost a month at a time. I even just looked at the calendar and worried. Still, I am grateful and proud that my son has grown up well. However, I am still doing solo parenting now. Sometimes I get so angry I feel like I might explode, but when we are together, I endure because he is a great dad and does his best.