how nice that you have turned to WeFugees. I can understand very well that you are afraid of being deported. This worry and uncertainty are a very big burden.
The foreigners authorities consider non-appearance as a lack of obligation to cooperate. That is why your lawyer also asked you to get a medical certificate and submit it. In order to be able to assess what consequences this will have for you, your entire situation must be considered. This includes questions such as: how long have you been in Germany, how long have you been in toleration, what have you already done in the context of clarifying your identity, are you allowed to work, do you have a job or are you in training, what is your lawyer's mandate, etc. This detailed information should not be shared publicly within the framework of WeFugees and therefore makes it impossible to give you a concrete or even reassuring answer at this point.
As you already have a specialist lawyer, I strongly recommend that you clarify your options for action as well as the further procedure with him/her directly. That is his/her area of expertise. If you find it difficult to contact and discuss your case with your lawyer, I recommend that you also contact a local refugee counselling centre and seek support. The colleagues will help you competently and are a good complement to the work of the lawyer.
I hope that your residence situation will soon be clarified and wish you all the best.