Progress comes gradually. Mistakes are bound to be made-learn from them. When you realize you have made an error, smile and start again!
It is common to experience drowsiness, agitation, mind-wandering and other difficulties in meditation, but if you persevere you will be successful.
You are welcome to contact the Teachers or Assistant Teachers for guidance.
Make use of the support of your fellow meditators. Sitting with them will give you strength.
Make use of the meditative atmosphere at centers or Dhamma houses by going there to sit whenever you can, even for a few days or hours. As an old student you are also welcome to come for part of a ten-day course, depending on the availability of space, and assuming you have been practicing this technique of Vipassana only.
Real wisdom is recognizing and accepting that every experience is impermanent. With this insight you will not be overwhelmed by ups and downs. And when you are able to maintain an inner balance, you can choose to act in ways that will create happiness for you and for others. Living each moment happily with an equanimous mind, you will surely progress toward the ultimate goal of liberation from all suffering.
