std::stringstream ss;

PROCESS_MEMORY_COUNTERS_EX pmc;
GetProcessMemoryInfo(GetCurrentProcess(), (PROCESS_MEMORY_COUNTERS*)&pmc, sizeof(pmc));
SIZE_T physMemUsedByMe = pmc.WorkingSetSize;

ss << "nMEM: " << (physMemUsedByMe / 1024 / 1024) << " MB";

debugText.setString(ss.str());