It is very human to go through this state of mind. Feeling low with seeing near ones in pain.
The good part you expressed that few of your prayers has been answered. Few yet to be answered.
Life is a journey with ups and downs. This is true for every human being. Some are bold like you to express it openly. Now that we have VK , we are blessed.
Some people suffer with past medical history and or maybe some other reasons, so here the energy requirement is more. This will need patience.
I was sending energy to a person with autoimmune disease with VK for months together taking care of the symptoms. The person showed improvement in few organs and it resulted in more active life, reducing of symptoms. When i met Sharat Sir i requested him if he could make serum for auto immune disorders and brain disorders. As i personally know Medical Science has its own limitations in these 2 areas.
After Sir launched both these new Serums i was among the most happiest you can say.Lots of gratitude to @"Sharat Sir-VK Inventor" for VK and these Cosmic Serums.
Now its more than 18 months that i am sending energies to this person, past few months Immune Serum, the quality of life has improved in some ways.
What would have happened if I would have lost hopes , i would have missed to see someone’s happiness !!
Now we do face such times that we feel ……where are we in this journey with so much to do. At that time i simply say "VK PLEASE GET ME OUT OF THIS SITUATION".
Something happens and my mind changes. The status remains the same, as overnight things don’t change unless there is a miracle for everything.
But I GET BACK MY POWER TO FACE THE SITUATION AND TO GET BACK INTO ACTION….and Witness more Smiles. 
This is the best way I HAVE BEEN COMING OUT OF DILEMMA when i feel hopeless.
Another way is to chant GOLDEN SUNRISE for few minutes and see how amazing you feel !!
As Anit suggested, you can take that combination of energies regularly to keep yourself happy and confident.
Just remember, .. to see the changes/health improvement in anyone’s life through your VK…. is itself a boon and satisfying voyage….Aim is always that people get the blessing to live a normal healthy life now and forever.
KEEP GOING IS THE MANTRA OF LIFE. LIVE IT WITH FAITH AND PATIENCE !!
I hope i could answer some of your questions . GOLDEN SUNRISE to all your efforts !!