So, I figured when I started on the Zen path, is that I needed to control my mind. If I got sufficient control over it, it will be in peaceful state all the time. I will have bliss and nirvana, and I have achieved my target. Well, seems like reality is way different! So, the mind is a phenomena, just like anything else, with its inherent nature. If you put water on heat, it will boil because of its inherent nature, same way as wood will burn if exposed to heat and oxygen. The mind will be happy when it gets something that it wants and will be sad when it gets something that it does not. There is no way around it, that is how it is programmed. So, then you would say that the answer is to get rid of the root cause - the want. Let me tell you friends - that is not easy or even entirely possible, for most of us who live in mundane world. I cannot get rid of my desire to see my family happy. If they are going through pain, it pains me and I want the suffering to end. A lot of times, when issues are related to having a job or sickness, it is not even a want, it is a need. How can I say it does not matter whether the situation gets rectified or not?
So, back to the question - I don't think it is expected to change nature of mind so much through meditation, but to understand its nature, see how it works and ACCEPT it. Resistance is what causes pain. If I can accept that my mind is sad because of conditions and there is no way to alter its state, but to accept the sadness of moment, it lessens the blow. As long as we are trying actively to change the situation (applying for jobs, getting medical care etc), we are doing what we need to do. Everything changes, and this situation will also change.