Problem with Interrupts (PIC 18F)

/** I N C L U D E S **********************************************************/

#include <p18f4550.h>
#include<adc.h>
#include<delays.h>
#include<timers.h>
#include<portb.h>
#include <lcd.h>

/** V A R I A B L E S ********************************************************/

#pragma udata

#pragma interrupt high_isr


int T1 = 0;
int T2 = 0;
int F = 0;
int TempF = 0;
int Energy = 0;
int ValidF = 0;
int WaterFlown = 0;


#define LED1	PORTDbits.RD1
#define Flow_int	PORTBbits.RB1	//For interrupt check

#define Flow_bit	PORTBbits.RB7	//For spike check
#define WSBridge_Power	PORTAbits.RA1	//To power Wheat Stone Bridge circuit



/** V E C T O R  R E M A P P I N G 
*******************************************/

extern void _startup (void);        // See c018i.c in your C18 compiler dir

#pragma code _RESET_INTERRUPT_VECTOR = 0x000800

void _reset (void)
{
    _asm goto _startup _endasm

}

#pragma code

#pragma code _HIGH_INTERRUPT_VECTOR = 0x000808

void interrupt_at_high_vector(void)
{
  _asm GOTO high_isr _endasm
}

#pragma code _LOW_INTERRUPT_VECTOR = 0x000818

void _low_ISR (void)
{
     ;
}

#pragma code /* return to the default code section */


#pragma interrupt high_isr

void high_isr(void)

{
   	INTCON3bits.INT1IF = 0; //CLEAR INT FLAG
	
	WSBridge_Power = 1;

	Delay_ms(10);
	
        ConvertADC(); 
	
        while(BusyADC());
	T1 = ReadADC();
	Delay_us(100);
	
	WriteInt(T1,4);
	Delay_ms(100);

	F = ReadTimer1();	//New Reading
	Delay_ms(100);

	WriteInt(F,2);
   	Delay_ms(1000);

	LED1 = 0;		
	
}	


/** D E C L A R A T I O N S **************************************************/
#pragma code

void initall(void);


 	
/************Defined in LCD Header File**************/

/*******LCD************/
//#define RS              PORTAbits.RA3
//#define E               PORTAbits.RA4 

//CONTROL PINS

//#define DAT4	PORTAbits.RA5
//#define DAT5	PORTEbits.RE0
//#define DAT6	PORTEbits.RE1
//#define DAT7	PORTEbits.RE2	

//Test LEDs



void initall(void){
	TRISAbits.TRISA0=1; 
	
	//For Wheat Stone Bridge
	TRISAbits.TRISA1=0;  

	//LCD
	TRISAbits.TRISA3=0; 
	TRISAbits.TRISA4=0; 
	TRISAbits.TRISA5=0; 
	TRISEbits.TRISE0=0; 
	TRISEbits.TRISE1=0; 
	TRISEbits.TRISE2=0; 

	//Flow Meter Input For Interrupt
	TRISBbits.TRISB1=1;

	//Flow Meter Input For Spike Check
	TRISBbits.TRISB7=1; 
	
 	//Test LED
	TRISDbits.TRISD1=0; 
}




void EnableExternalTimers(void)
{
	T1CONbits.TMR1ON=0;			// stop timer
	T1CONbits.TMR1CS=1;			// transition on T13CKI pin (Rising Edge)
	T1CONbits.T1CKPS1=0;		// prescalar 00
	T1CONbits.T1CKPS0=0;		// prescalar 00
	T1CONbits.T1RUN=0;			// device clock from another source
	T1CONbits.T1OSCEN=0;		// osc shut for power
	T1CONbits.T1SYNC=0;			// syncronisation
	TMR1H = 0;                  // clear timer
  	TMR1L = 0;                  // clear timer
	T1CONbits.TMR1ON=1;			// start timer
	PIE1bits.TMR1IE = 0;		// interrupt disable
}





void main(void)
{
	int a = 0;
	int b=0;
	int c=0;
	char z[9] = "IIT Delhi";
	char z1[7] = "BTP-SWH";

        ADCON1 |= 0x0E;                 // Default all pins to digital, except 2
	
	OpenADC( ADC_FOSC_32 & ADC_RIGHT_JUST & ADC_16_TAD , ADC_CH0 & ADC_INT_OFF & ADC_REF_VDD_VSS , ADC_1ANA );	//robotics club
	//OpenADC( ADC_FOSC_32 & ADC_RIGHT_JUST & ADC_16_TAD , ADC_CH1 & ADC_INT_OFF & ADC_REF_VDD_VSS , ADC_2ANA );
	
    EnableExternalTimers();

   	initall();	LCDinit();	ClearScreen();


	

	WriteStringL(z,9);	
        Delay_ms(1000);	
        ClearScreen();
	WriteStringL(z1,7);
	Delay_ms(1000);
        ClearScreen();
	
	
		
	WDTCONbits.SWDTEN = 0; //WDT disabled

//	//For external interrupt one
	INTCON3bits.INT1IF =0;	//External interrupt 1 Flag
	INTCONbits.GIE = 1;	//Global interrupt enable	
	INTCON3bits.INT1IE = 1;	//External interrupt 1 enable
	INTCON2bits.INTEDG1 = 1;	//Rising edge interrupt


	WSBridge_Power = 1;
	


	while(1)
   {		

		LED1 = 1;
		ClearScreen();
		Sleep();	
		ClearScreen();	
		WriteInt(99,2);
		Delay_ms(1000);
		ClearScreen();
					 
	}
}

//end 



/** EOF Demo02.c *************************************************************/