How can I setup multiple alarms in Android?

So far and thanks to this website, I've been able to set up an alarm that will be set up and active, even if I turn of my phone.

Now, I set up a alarm to show a reminder for event A and I need the application to setup another alarm to show another reminder for event B.

I must be doing something wrong, because it only fires the reminder for event A. It seems that once set up, any other alarm is understood as the same one. :-(

Here is the detail of what I am doing in two steps:

1) From an activity I set an alarm that at certain time and date will call a receiver

                Intent intent = new Intent(Activity_Reminder.this,
                        AlarmReceiver_SetOnService.class);

                intent.putExtra("item_name", prescription
                        .getItemName());
                intent
                        .putExtra(
                                "message",
                                Activity_Reminder.this
                                        .getString(R.string.notif_text));
                intent.putExtra("item_id", itemId);
                intent.putExtra("activityToTrigg",
                        "com.companyName.appName.main.Activity_Reminder");

                PendingIntent mAlarmSender;

                mAlarmSender = PendingIntent.getBroadcast(
                        Activity_Reminder.this, 0, intent, 0);

                long alarmTime = dateMgmt.getTimeForAlarm(pickedDate);
                Calendar c = Calendar.getInstance();
                c.setTimeInMillis(alarmTime);
                // Schedule the alarm!
                AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
                am.set(AlarmManager.RTC_WAKEUP, alarmTime + 15000,
                        mAlarmSender);

2) From the receiver I call a service

        Bundle bundle = intent.getExtras();
        String itemName = bundle.getString("item_name");
        String reminderOrAlarmMessage = bundle.getString("message");
        String activityToTrigg = bundle.getString("activityToTrigg");
        int itemId = Integer.parseInt(bundle.getString("item_id"));
        NotificationManager nm = (NotificationManager) context.getSystemService("notification");
        CharSequence text = itemName + " "+reminderOrAlarmMessage;
        Notification notification = new Notification(R.drawable.icon, text,
                System.currentTimeMillis());
        Intent newIntent = new Intent();
        newIntent.setAction(activityToTrigg);
        newIntent.putExtra("item_id", itemId);
        CharSequence text1= itemName + " "+reminderOrAlarmMessage;
        CharSequence text2= context.getString(R.string.notif_Go_To_Details);
        PendingIntent pIntent = PendingIntent.getActivity(context,0, newIntent, 0);
        notification.setLatestEventInfo(context, text1, text2, pIntent);
        notification.flags = Notification.FLAG_AUTO_CANCEL;
        notification.defaults = Notification.DEFAULT_ALL;
        nm.notify(itemId, notification);

Thanks in Advance,

monn3t